List of United States Navy ships: N–O

N

 * USS N-1 (USS N-1 (SS-53))
 * USS N-2 (USS N-2 (SS-54))
 * USS N-3 (USS N-3 (SS-55))
 * USS N-4 (USS N-4 (SS-56))
 * USS N-5 (USS N-5 (SS-57))
 * USS N-6 (USS N-6 (SS-58))
 * USS N-7 (USS N-7 (SS-59))

Na

 * USS Nabigwon (USS Nabigwon (YTB-521)/USS Nabigwon (YTM-521))
 * USS Nacheninga (USS Nacheninga (YTB-520)/USS Nacheninga (YTM-520))
 * USS Nadli (USS Nadli (YTB-534)/USS Nadli (YTM-534))
 * USS Nahant (USS Nahant (1862), USS Nahant (SP-1250), USS Nahant (YN-102)/USS Nahant (AN-83))
 * USS Nahasho (USS Nahasho (YTB-535)/USS Nahasho (YTM-535))
 * USS Nahma (USS Nahma (YFB-1), USS Nahma (SP-771))
 * USS Nahoke (USS Nahoke (YTB-536)/USS Nahoke (YTM-536))
 * USS Nahunta (USS Nahunta (1872))
 * USS Naiad (USS Naiad (1863))
 * USS Naifeh (USS Naifeh (DE-352))
 * USS Naiwa (USS Naiwa (SP-3512))
 * USS Najelda (USS Najelda (SP-277))
 * USS Nakarna (USS Nakarna (YTB-393)/USS Nakarna (YTM-393))
 * USS Namakagon (USS Namakagon (AOG-53))
 * USS Namequa (USS Namequa (YT-331)/USS Namequa (YTB-331))
 * USS Namontack (USS Namontack (YN-46)/USS Namontack (YNT-14)/USS Namontack (YTB-738))
 * USS Nanigo (USS Nanigo (YTB-537)/USS Nanigo (YTM-537))
 * USS Nansemond (USS Nansemond (1862), USS Nansemond (1896))
 * USS Nansemond County (USS Nansemond County (LST-1064))
 * USS Nanshan (USS Nanshan (AG-3))
 * USS Nantahala (USS Nantahala (ID-3519), USS Nantahala (AO-60))
 * USS Nantasket (USS Nantasket (1867))
 * USS Nanticoke (USS Nanticoke (AOG-66), USS Nanticoke (YTB-803))
 * USS Nantucket (USS Nantucket (1862), USS Nantucket (1907), USS Nantucket (PG-23)/USS Nantucket (IX-18), USS Nantucket (SP-1153))
 * USS Naos (USS Naos (AK-105))
 * USS Napa (USS Napa (1862), USS Napa (AT-32), USS Napa (APA-157)/USS Napa (LPA-157))
 * USS Narada (USS Narada (SP-161))
 * USS Narcissus (USS Narcissus (1863), USCGC Narcissus (WAGL-238))
 * USS Narkeeta (USS Narkeeta (1891), USS Narkeeta (YT-3), USS Narkeeta (YT-133)/USS Narkeeta (YTM-133))
 * USS Narragansett (USS Narragansett (1859), USS Narragansett (SP-2196), USS Narragansett (SP-1163)/USS Narragansett (YFB-1163), USS Narragansett (AT-88)/USS Narragansett (ATF-88), USNS Narragansett (T-ATF-167))
 * USS Narraguagas (USS Narraguagas (AOG-32))
 * USS Narwhal (USS Narwhal (SS-17), USS Narwhal (SS-167), USS Narwhal (SSN-671))
 * USS Nashawena (USS Nashawena (AG-142)/USS Nashawena (YAG-35))
 * USS Nashel (USS Nashel (YTB-538))
 * USS Nashira (USS Nashira (AK-85))
 * USS Nashua (USS Nashua (YTB-774))
 * USS Nashville (USS Nashville (PG-7), USS Nashville (CL-43), USS Nashville (LPD-13))
 * USS Nasomsee (USS Nasomsee (YT-260)/USS Nasomsee (YTB-260))
 * USS Nassau (USS Nassau (AVG-16)/USS Nassau (ACV-16)/USS Nassau (CVE-16)/USS Nassau (CVHE-16), USS Nassau (LHA-4))
 * USS Nassuk Bay (USS Nassuk Bay (ACV-67)/USS Nassuk Bay (CVE-67))
 * USS Natahki (USS Natahki (YTB-398)/USS Natahki (YTM-398))
 * USS Natalia (USS Natalia (SP-1251))
 * USS Natalie Mae (USS Natalie Mae (SP-1005))
 * USS Natchaug (USS Natchaug (AOG-54))
 * USS Natchez (USS Natchez (1827), USS Natchez (PG-85), USS Natchez (PG-102)/USS Natchez (PF-2))
 * USS Natchitoches (USS Natchitoches (YTB-799))
 * USS Nathan Hale (USS Nathan Hale (SSBN-623))
 * USS Nathanael Greene (USS Nathanael Greene (SSBN-636))
 * USS Nathaniel Taylor (USS Nathaniel Taylor (1863))
 * USS Natick (USS Natick (SP-570), USS Natick (YTB-760))
 * USS National Guard (USS National Guard (1857))
 * USS Natoma (USS Natoma (SP-666))
 * USS Natoma Bay (USS Natoma Bay (AVG-62)/USS Natoma Bay (ACV-62)/USS Natoma Bay (CVE-62)/USS Natoma Bay (CVU-62))
 * USS Natoya (USS Natoya (SP-396))
 * USS Natrona (USS Natrona (APA-214))
 * USS Naubuc (USS Naubuc (1864), USS Naubuc (YN-109)/USS Naubuc (AN-84)/USS Naubuc (YRST-4))
 * USS Naugatuck (USS Naugatuck (1862), USCGC Naugatuck (WYT-92), USS Naugatuck (YTM-753))
 * USS Naumkeag (USS Naumkeag (1863))
 * USS Nauset (USS Nauset (AT-89)/USS Nauset (ATF-189))
 * USS Nausett (USS Nausett (1865), USS Nausett (YT-35), USS Nausett (IX-190), USS Nausett (ACM-15)/USS Nausett (MMA-15))
 * USS Naushon (USS Naushon (SP-517))
 * USS Nautilus (USS Nautilus (1799), USS Nautilus (1847), USS Nautilus (SS-29), USS Nautilus (SS-168), USS Nautilus (SSN-571))
 * USS Nautilus II (USS Nautilus II (SP-559))
 * USS Navajo (USS Navajo (AT-52)/USS Navajo (IX-56), USS Navajo (AT-64), USS Navajo (ATA-211), USNS Navajo (T-ATF-169))
 * USS Navajo III (USS Navajo III (SP-298))
 * USS Navarro (USS Navarro (APA-215)/USS Navarro (LPA-215))
 * USS Navasota (USS Navasota (AO-106)/USNS Navasota (T-AO-106))
 * USCGC Navesink (USCGC Navesink (WYT-88))
 * USS Navigator (USS Navigator (SP-2225)/USS Navigator (YT-39)/USS Navigator (YTB-39), USS Navigator (ATA-203))
 * USS Navy Yard (USS Navy Yard (YFB-8))
 * USS Nawat (USS Nawat (YN-55)/USS Nawat (YNT-23))
 * USS Nawona (USS Nawona (YT-261)/USS Nawona (YTB-261))

Ne

 * USS Neal A. Scott (USS Neal A. Scott (DE-769))
 * USS Nebraska (USS Nebraska (1869), USS Nebraska (BB-14), USS Nebraska (SSBN-739))
 * USS Neches (USS Neches (AO-5), USS Neches (AO-47), USNS Neches (T-AO-183)/USNS Neches (T-AOT-183))
 * USS Nedeva II (USS Nedeva II (SP-64))
 * USS Needle (USS Needle (SP-649))
 * USS Needlefish (USS Needlefish (SS-379), USS Needlefish (SS-493))
 * USS Negwagon (USS Negwagon (YT-188)/USS Negwagon (YTB-188)/USS Negwagon (YTM-188), USS Negwagon (YTB-834))
 * USS Nehenta Bay (USS Nehenta Bay (CVE-74)/USS Nehenta Bay (CVU-74)/USS Nehenta Bay (AKV-24))
 * RV Neil Armstrong (RV Neil Armstrong)
 * USS Nelansu (USS Nelansu (SP-610))
 * USS Nellie (USS Nellie (1876))
 * USS Nellie Jackson (USS Nellie Jackson (SP-1459))
 * USS Nelson (USS Nelson (DD-623))
 * USCGC Nemaha (USCGC Nemaha (WSC-148))
 * USS Nemasket (USS Nemasket (AOG-10))
 * USS Nemes (USS Nemes (SP-424))
 * USS Nemesis (USS Nemesis (1869), USS Nemesis (SP-343), USCGC Nemesis (WPC-111))
 * USS Neodesha (USS Neodesha (YTB-815))
 * USS Neoga (USS Neoga (YT-263)/USS Neoga (YTB-263)/USS Neoga (YTM-263))
 * USS Neokautah (USS Neokautah (YT-284)/USS Neokautah (YTB-284))
 * USS Neomonni (USS Neomonni (YT-349))
 * USS Neosho (USS Neosho (1863), USS Neosho (AO-23), USS Neosho (AO-48), USS Neosho (AO-143)/USNS Neosho (T-AO-143))
 * USS Nepanet (USS Nepanet (YT-189)/USS Nepanet (YTB-189)/USS Nepanet (YTM-189))
 * USS Nepenthe (USS Nepenthe (SP-112))
 * USS Neponset (USS Neponset (ID-3581))
 * USS Neptune (USS Neptune (1863), USS Neptune (1869), USS Neptune (AC-8), USS Neptune (ARC-2)/USNS Neptune (T-ARC-2))
 * USS Nereus (USS Nereus (1863), USS Nereus (AC-10), USS Nereus (AS-17))
 * USS Nerita (USS Nerita (SP-3028))
 * USS Nerka (USS Nerka (SS-380))
 * USS Nero (USS Nero (AC-17))
 * USS Neshaminy (USS Neshaminy (1865))
 * USS Neshanic (USS Neshanic (AO-71))
 * USS Neshoba (USS Neshoba (APA-216))
 * USS Nespelen (USS Nespelen (AOG-55))
 * USS Nestor (USS Nestor (ARB-6))
 * USS Nesutan (USS Nesutan (YT-338)/USS Nesutan (YTB-338))
 * USS Neswage (USS Neswage (YN-49)/USS Neswage (YNT-17))
 * USS Nettie (USS Nettie (SP-1436))
 * USS Nettle (USS Nettle (1814), USS Nettle (1862))
 * USS Neuendorf (USS Neuendorf (DE-200))
 * USS Neunzer (USS Neunzer (DE-150))
 * USS Nevada (USS Nevada (BM-8), USS Nevada (BB-36), USS Nevada (SSBN-733))
 * USS Neville (USS Neville (AP-16)/USS Neville (APA-9))
 * USS New (USS New (DD-818))
 * USS New Bedford (USS New Bedford (PG-179)/USS New Bedford (PF-71), USNS New Bedford (T-AKL-17)/USS New Bedford (IX-308))
 * USS New Berne (USS New Berne (1862))
 * USS New England (USS New England (1861), USS New England (ID-1222), USS New England (AS-28)/USS New England (AD-32))
 * USS New Era (USS New Era (1862))
 * USS New Hampshire (USS New Hampshire (1864), USS New Hampshire (BB-25), USS New Hampshire (BB-70), USS New Hampshire (SSN-778))
 * USS New Hanover (USS New Hanover (AKA-73))
 * USS New Haven (USS New Haven (1776), USS New Haven (CL-76), USS New Haven (CL-109), USS New Haven (CLK-2))
 * USS New Ironsides (USS New Ironsides (1862))
 * USS New Jersey (USS New Jersey (BB-16), USS New Jersey (BB-62))
 * USS New Kent (USS New Kent (APA-217))
 * USS New London (USS New London (1859))
 * USS New London County (USS New London County (LST-1066)/USNS New London County (T-LST-1066))
 * USS New Mexico (USS New Mexico (BB-40), USS New Mexico (SSN-779))
 * USS New National (USS New National (1862))
 * USS New Orleans (USS New Orleans (1815), USS New Orleans (PG-34)/USS New Orleans (CL-22), USS New Orleans (CL-32)/USS New Orleans (CA-32), USS New Orleans (LPH-11), USS New Orleans (LPD-18))
 * USS New Uncle Sam (USS New Uncle Sam (1862))
 * USS New York (USS New York (1776), USS New York (1800), USS New York (1820), USS New York (1869), USS New York (ACR-2), USS New York (BB-34), USS New York (LPD-21))
 * USS New York City (USS New York City (SSN-696))
 * USS Newark (USS Newark (C-1), USS Newark (SP-266), USS Newark (CL-88), USS Newark (CL-100), USS Newark (CL-108))
 * USS Newberry (USS Newberry (APA-158))
 * USS Newburgh (USS Newburgh (ID-1369))
 * USS Newcastle Victory (USS Newcastle Victory (AK-233))
 * USS Newcomb (USS Newcomb (DD-586))
 * USS Newell (USS Newell (DE-322)/USCGC Newell (WDE-422)/USS Newell (DER-322))
 * USS Newman (USS Newman (DE-205)/USS Newman (APD-59))
 * USS Newman K. Perry (USS Newman K. Perry (DD-883)/USS Newman K. Perry (DDR-883))
 * USS Newport (USS Newport (PG-12)/USS Newport (IX-19), USS Newport (PG-135)/USS Newport (PF-27), USS Newport (LST-1179))
 * USS Newport News (USS Newport News (AK-3), USS Newport News (CA-148), USS Newport News (SSN-750))
 * USS Newton (USS Newton (1901), USS Newton (ID-4306))
 * USS Nezinscot (USS Nezinscot (1898))

Ni

 * USS Niagara (USS Niagara (1813), USS Niagara (1855), USS Niagara (1898), USS Niagara (SP-246), USS Niagara (SP-263), USS Niagara (SP-136)/USS Niagara (PY-9), USS Niagara (CMc-2)/USS Niagara (PG-52)/USS Niagara (AGP-1), USS Niagara (APA-87))
 * USS Niagara Falls (USS Niagara Falls (AFS-3)/USNS Niagara Falls (T-AFS-3))
 * USS Niantic (USS Niantic (AVG-46)/USS Niantic (ACV-46)/USS Niantic (CVE-46), USS Niantic (YTB-781))
 * USS Niantic Victory (USS Niantic Victory (AGM-6))
 * USS Niblack (USS Niblack (DD-424))
 * USS Nicholas (USS Nicholas (DD-311), USS Nicholas (DD-449)/USS Nicholas (DDE-449), USS Nicholas (FFG-47))
 * USS Nicholson (USS Nicholson (TB-29), USS Nicholson (DD-52), USS Nicholson (DD-442), USS Nicholson (DD-982))
 * USS Nicollet (USS Nicollet (AK-199)/USS Nicollet (AG-93)/USS Nicollet (AVS-6))
 * USS Nields (USS Nields (DD-616))
 * USS Nightingale (USS Nightingale (1851), USS Nightingale (SP-523), USS Nightingale (AMc-18), USS Nightingale (AMc-149)/USS Nightingale (IX-177), USS Nightingale (AMS-50)/USS Nightingale (MSC(O)-50))
 * USS Nihoa (USS Nihoa (YFB-17))
 * USS Niji (USS Niji (SP-33))
 * USCGC Nike (USCGC Nike (WPC-112))
 * USS Nimble (USS Nimble (AM-266), USS Nimble (AM-459)/USS Nimble (MSO-459))
 * USS Nimitz (USS Nimitz (CVN-68))
 * USS Nina (USS Nina (1865))
 * USS Niobe (USS Niobe (1869))
 * USS Niobrara (USS Niobrara (AO-72))
 * USS Niphon (USS Niphon (1863))
 * USS Nipmuc (USS Nipmuc (AT-157)/USS Nipmuc (ATF-157))
 * USS Nipsic (USS Nipsic (1863))
 * USS Nirvana (USS Nirvana (SP-706))
 * USS Nirvana II (USS Nirvana II (SP-204))
 * USS Nita (USS Nita (1856))
 * USS Nitro (USS Nitro (AE-2), USS Nitro (AE-23))
 * USS Nitze (USS Nitze (DDG-94))

No

 * USS Noa (USS Noa (DD-343)/USS Noa (APD-24), USS Noa (DD-841))
 * USS Noble (USS Noble (1861), USS Noble (APA-218))
 * MV Noble Star (MV Noble Star (AK-9653))
 * USS Nodaway (USS Nodaway (AOG-67), USNS Nodaway (T-AOG-78))
 * USS Nogales (USS Nogales (YTB-777))
 * USS Noka (USS Noka (YN-54)/USS Noka (YNT-22))
 * USS Nokomis (USS Nokomis (SP-609)/USS Nokomis (PY-6), USS Nokomis (YT-142)/USS Nokomis (YTB-142)/USS Nokomis (YTM-742))
 * USS Noma (USS Noma (SP-131))
 * USS Nomad (USS Nomad (SP-1046))
 * USS Nonata (USS Nonata (1846))
 * USS Nonpareil (USS Nonpareil (SP-370)/USS Nonpareil (YT-40))
 * USS Nonsuch (USS Nonsuch (1813))
 * USS Noord Brabant (USS Noord Brabant (1918))
 * USS Nootka (USS Nootka (YTB-508)/USS Nootka (YTM-771))
 * USS Nopatin (USS Nopatin (SP-2195))
 * USS Norfolk (USS Norfolk (1798), USS Norfolk (CA-137), USS Norfolk (DL-1), USS Norfolk (SSN-714))
 * USS Norfolk Packet (USS Norfolk Packet (1862))
 * USS Norlina (USS Norlina (ID-1597))
 * USS Norma (USS Norma (AK-86))
 * USS Norman Scott (USS Norman Scott (DD-690))
 * USS Normandy (USS Normandy (CG-60))
 * USS Normannia (USS Normannia (SP-756))
 * USS Norris (USS Norris (DD-859)/USS Norris (DDE-859))
 * USS North (USS North (YFB-46))
 * USS North Carolina (USS North Carolina (1820), USS North Carolina (ACR-12), USS North Carolina (BB-52), USS North Carolina (BB-55), USS North Carolina (SSN-777))
 * USS North Dakota (USS North Dakota (BB-29), USS North Dakota (SSN-784))
 * USS North Pole (USS North Pole (SP-3791))
 * USCGC North Star (USCGC North Star (WPG-59))
 * USS Northampton (USS Northampton (SP-670), USS Northampton (CL-26)/USS Northampton (CA-26), USS Northampton (CA-125)/USS Northampton (CLC-1)/USS Northampton (CC-1))
 * USNS Northern Light (USNS Northern Light (T-AK-284))
 * USS Northern Pacific (USS Northern Pacific (1917))
 * USCGC Northland (USCGC Northland (WPG-49))
 * USS Northwind (USS Northwind (AGB-5))
 * USS Norton Sound (USS Norton Sound (AV-11)/USS Norton Sound (AVM-1))
 * USNS Norwalk (USNS Norwalk (T-AK-279))
 * USS Norwich (USS Norwich (1812), USS Norwich (1861))
 * USS Notable (USS Notable (AM-267), USS Notable (AM-460)/USS Notable (MSO-460))
 * USS Nottoway (USS Nottoway (YT-18), USS Nottoway (ATA-183))
 * USS Nourmahal (USS Nourmahal (PG-72))
 * USS Noxubee (USS Noxubee (AOG-56))

Nr–Ny

 * USS NR-1 (NR-1)
 * USS Nucleus (USS Nucleus (AM-268)/USS Nucleus (MSF-268))
 * USS Nueces (USS Nueces (APB-40)/USS Nueces (IX-503))
 * USS Numa (USS Numa (YTB-399)/USS Numa (YTM-399))
 * USS Numitor (USS Numitor (ARL-17))
 * USS Nuthatch (USS Nuthatch (AM-60)/USS Nuthatch (MSF-60))
 * USS Nutmeg (USS Nutmeg (YN-28)/USS Nutmeg (AN-33))
 * USS Nyack (USS Nyack (1863), USS Nyack (YT-19))
 * USS Nyanza (USS Nyanza (1863))
 * USS Nye County (USS Nye County (LST-1067)/USNS Nye County (T-LST-1067))
 * USS Nymph (USS Nymph (1863))

O

 * USS O'Bannon (USS O'Bannon (DD-177), USS O'Bannon (DD-450)/USS O'Bannon (DDE-450), USS O'Bannon (DD-987))
 * USS O'Brien (USS O'Brien (TB-30), USS O'Brien (DD-51), USS O'Brien (DD-415), USS O'Brien (DD-725), USS O'Brien (DD-975))
 * USS O'Callahan (USS O'Callahan (DE-1051)/USS O'Callahan (FF-1051))
 * USS O'Flaherty (USS O'Flaherty (DE-340))
 * USS O'Hare (USS O'Hare (DD-889)/USS O'Hare (DDR-889))
 * USS O'Kane (USS O'Kane (DDG-77))
 * USS O'Neill (USS O'Neill (DE-188))
 * USS O'Reilly (USS O'Reilly (DE-330))
 * USS O'Toole (USS O'Toole (DE-274), USS O'Toole (DE-527))
 * USS O-1 (USS O-1 (SS-62))
 * USS O-2 (USS O-2 (SS-63))
 * USS O-3 (USS O-3 (SS-64))
 * USS O-4 (USS O-4 (SS-65))
 * USS O-5 (USS O-5 (SS-66))
 * USS O-6 (USS O-6 (SS-67))
 * USS O-7 (USS O-7 (SS-68))
 * USS O-8 (USS O-8 (SS-69))
 * USS O-9 (USS O-9 (SS-70))
 * USS O-10 (USS O-10 (SS-71))
 * USS O-11 (USS O-11 (SS-72))
 * USS O-12 (USS O-12 (SS-73))
 * USS O-13 (USS O-13 (SS-74))
 * USS O-14 (USS O-14 (SS-75))
 * USS O-15 (USS O-15 (SS-76))
 * USS O-16 (USS O-16 (SS-77))
 * USS O. H. Lee (USS O. H. Lee (1861))
 * USS O. M. Pettit (USS O. M. Pettit (1857))

Oa–Og

 * USS Oahu (USS Oahu (PG-46)/USS Oahu (PR-6), USS Oahu (ARG-5))
 * USS Oak Hill (USS Oak Hill (APM-7)/USS Oak Hill (LSD-7), USS Oak Hill (LSD-51))
 * USS Oak Ridge (USS Oak Ridge (ARDM-1))
 * USS Oakland (USS Oakland (1918), USS Oakland (CL-95)/USS Oakland (CLAA-95))
 * USS Oberlin (USS Oberlin (PC-560))
 * USS Oberon (USS Oberon (AK-56)/USS Oberon (AKA-14)/USNS Oberon (T-AKA-14)/USS Oberon (LKA-14))
 * USS Oberrender (USS Oberrender (DE-344))
 * USS Obispo (USS Obispo (SS-382))
 * USS Observation Island (USS Observation Island (E-AG-154)/USNS Observation Island (T-AGM-23))
 * USS Observer (USS Observer (AMc-91), USS Observer (AM-461)/USS Observer (MSO-461))
 * USS Obstructor (USS Obstructor (ACM-7))
 * USS Ocala (USS Ocala (YTB-805))
 * USS Oceanographer (OSS-26/USS Oceanographer (AGS-3))
 * USS Oceanside (USS Oceanside (LSM-175))
 * USS Oceanus (USS Oceanus (ARB-2))
 * USS Ocelot (USS Ocelot (IX-110))
 * USS Ochlockonee (USS Ochlockonee (AOG-33))
 * USS Ocklawaha (USS Ocklawaha (AO-84)/USNS Ocklawaha (T-AO-84))
 * USS Ocmulgee (USS Ocmulgee (YTB-532))
 * USS Ocoee (USS Ocoee (SP-1208))
 * USS Oconee (USS Oconee (AT-31), USS Oconee (AOG-34))
 * USS Oconostota (USS Oconosota (YT-375)/USS Oconostota (YTB-375)/USS Oconosota (YTM-375))
 * USS Oconto (USS Oconto (APA-187))
 * USS Octans (USS Octans (AF-26))
 * USS Octavia (USS Octavia (AF-46))
 * USS Octopus (USS Octopus (SS-9))
 * USS Octorara (USS Octorara (1861), USS Octorara (IX-139))
 * USS Odax (USS Odax (SS-484))
 * USS Odum (USS Odum (DE-670)/USS Odum (APD-71))
 * USS Ogden (USS Ogden (PG-147)/USS Ogden (PF-39), USS Ogden (LPD-5))
 * USS Ogeechee (USS Ogeechee (AOG-35))
 * USS Oglala (USS Oglala (CM-4)/USS Oglala (ARG-1))
 * USS Oglethorpe (USS Oglethorpe (AKA-100))

Oh–On

 * USS Ohio (USS Ohio (1812), USS Ohio (1820), USS Ohio (BB-12), USS Ohio (BB-68), USS Ohio (SSBN-726)/USS Ohio (SSGN-726))
 * USS Ohioan (1914)
 * USS Ojanco (USS Ojanco (SS-381))
 * USS Ojen (USS Ojen (SP-957))
 * USS Okala (USS Okala (ARS(T)-2))
 * USS Okaloosa (USS Okaloosa (APA-219))
 * USS Okanogan (USS Okanogan (APA-220)/USS Okanogan (LPA-220))
 * USS Okinawa (USS Okinawa (CVE-127), USS Okinawa (LPH-3))
 * USS Okisko (USS Okisko (YN-42)/USS Okisko (YNT-10)/USS Okisko (YTL-735))
 * USS Oklahoma (USS Oklahoma (BB-37))
 * USS Oklahoma City (USS Oklahoma City (CL-91)/USS Oklahoma City (CLG-5)/USS Oklahoma City (CG-5), USS Oklahoma City (SSN-723))
 * USS Okmulgee (USS Okmulgee (YTB-765))
 * USS Olathe (USS Olathe (YTM-273))
 * USS Old Colony (USS Old Colony (SP-1254))
 * USS Old Columbia (USS Old Columbia (CA-16))
 * USS Old Constitution (1797)
 * USS Old Dominion (USS Old Dominion (ID-3025))
 * USS Oldendorf (USS Oldendorf (DD-972))
 * USS Oleander (USS Oleander (1863), USCGC Oleander (WAGL-264))
 * USS Oliver H. Lee (USS Oliver H. Lee (1861))
 * USS Oliver Hazard Perry (USS Oliver Hazard Perry (PFG-109)/USS Oliver Hazard Perry (FFG-7))
 * USS Oliver Mitchell (USS Oliver Mitchell (DE-417))
 * USS Oliver Wolcott (USS Oliver Wolcott (1832))
 * USS Olivin (USS Olivin (PYc-22))
 * USS Olmstead (USS Olmstead (APA-188)/USS Olmstead (LPA-188))
 * USS Olney (USS Olney (PC-1172))
 * USS Olympia (USS Olympia (C-6)/USS Olympia (CL-15)/USS Olympia (CA-15)/USS Olympia (IX-40), USS Olympia (SSN-717))
 * USS Olympic (USS Olympic (SP-260))
 * USS Omaha (USS Omaha (1869), USS Omaha (CL-4), USS Omaha (SSN-692), USS Omaha (LCS-12))
 * USS Ommaney Bay (USS Ommaney Bay (CVE-79))
 * USCGC Onandago (USCGC Onandago (1925))
 * USS Ondina (USS Ondina (1899))
 * USS Oneida (USS Oneida (1809), USS Oneida (1861), USS Oneida (1898), SP-765, USS Oneida (APA-221))
 * USS Oneka (USS Oneka (YN-35)/USS Oneka (YNT-3)/USS Oneka (YTM-729))
 * USS Oneonta (USS Oneonta (SP-1138))
 * USS Oneota (USS Oneota (1864), USS Oneota (YN-110)/USS Oneota (AN-85))
 * USS Oneyana (USS Oneyana (YT-262)/USS Oneyana (YTB-262)/USS Oneyana (YTM-262))
 * USS Onkahye (USS Onkahye (1843))
 * USS Ono (USS Ono (SP-128), USS Ono (SS-357))
 * USS Onockatin (USS Onockatin (YT-277)/USS Onockatin (YTB-277))
 * USS Onondaga (USS Onondaga (1864), USS Onondaga (1917), USCGC Onondaga (WPG-79))
 * USS Onset (USS Onset (SP-1224))
 * USS Onslow (USS Onslow (AVP-48))
 * USS Ontario (USS Ontario (1812), USS Ontario (1813), USS Ontario (AC-2), USS Ontario (AT-13)/USS Ontario (ATO-13))
 * USS Ontonagon (USS Ontonagon (AOG-36)/USNS Ontonagon (T-AOG-36))
 * USS Onward (USS Onward (1852), USS Onward (SP-311))
 * USS Onward II (USS Onward II (SP-728))
 * USS Onwego (USS Onwego (PYc-48))
 * USS Onyx (USS Onyx (PYc-5))

Oo–Os

 * USS Oosterdijk (USS Oosterdijk (ID-2586))
 * USS Opal (USS Opal (PYc-8))
 * USS Opelika (USS Opelika (YTB-798))
 * USS Ophir (USS Ophir (1904))
 * USS Opponent (USS Opponent (AM-269)/USS Opponent (MSF-269))
 * USS Opportune (USS Opportune (ARS-41))
 * USS Ora (USS Ora (SP-75))
 * USS Oracle (USS Oracle (AM-103)/USS Oracle (MSF-103))
 * USS Orange (USS Orange (PG-151)/USS Orange (PF-43))
 * USS Orange County (USS Orange County (LST-1068))
 * USS Oratamin (USS Oratamin (YT-347)/USS Oratamin (YTB-347)/USS Oratamin (YTM-347))
 * USS Orca (USS Orca (SS-34), USS Orca (SP-726), USS Orca (SS-381), USS Orca (AVP-49))
 * USCGC Orchid (USCGC Orchid (WAGL-240))
 * USS Ordronaux (USS Ordronaux (DD-617))
 * USS Oregon (USS Oregon (1841), USS Oregon (1869), USS Oregon (BB-3)/USS Oregon (IX-22))
 * USS Oregon City (USS Oregon City (CA-122), USS Oregon City (CG-13))
 * USS Oregonian (USS Oregonian (ID-1323))
 * USS Orestes (USS Orestes (AGP-10))
 * USS Oriole (USS Oriole (1864), USS Oriole (1895), USS Oriole (1904), USS Oriole (AMCU-33)/USS Oriole (MHC-33), USS Oriole (AM-7)/USS Oriole (AT-136)/USS Oriole (ATO-136), USS Oriole (MHC-55))
 * USS Orion (USS Orion (1869), USS Orion (AC-11), USS Orion (AS-18))
 * USS Oriskany (USS Oriskany (CV-18), USS Oriskany (CV-34)/USS Oriskany (CVA-34))
 * USS Orizaba (USS Orizaba (ID-1536)/USS Orizaba (AP-24))
 * USS Orlando (USS Orlando (PG-207)/USS Orlando (PF-99))
 * USS Orleans Parish (USS Orleans Parish (LST-1069)/USS Orleans Parish (MCS-6)/USNS Orleans Parish (T-LST-1069))
 * USS Orleck (USS Orleck (DD-886))
 * USS Ormsby (USS Ormsby (AP-94)/USS Ormsby (APA-49))
 * USS Orono (USS Orono (YT-190)/USS Orono (YTB-190)/USS Orono (YTM-190))
 * USS Ortolan (USS Ortolan (AM-45)/USS Ortolan (ASR-5), USS Ortolan (AMCU-34)/USS Ortolan (MHC-34), USS Ortolan (ASR-22))
 * USS Orvetta (USS Orvetta (1861), USS Orvetta (IX-157))
 * USS Osage (USS Osage (1863), USS Osage (AN-3)/USS Osage (AP-108)/USS Osage (LSV-3)/USS Osage (MCS-3))
 * USS Osamekin (USS Osamekin (YT-191)/USS Osamekin (YTB-191))
 * USS Osberg (USS Osberg (DE-538))
 * USS Osborne (USS Osborne (DD-295))
 * USS Oscar Austin (USS Oscar Austin (DDG-79))
 * USS Osceola (USS Osceola (1863), USS Osceola (1869), USS Osceola (AT-47), USS Osceola (YT-129)/USS Osceola (YTB-129)/USS Osceola (YTM-129))
 * USS Oshkosh (USS Oshkosh (YTB-757))
 * USS Oskaloosa (USS Oskaloosa (1918))
 * USS Oskawa (USS Oskawa (1919))
 * USS Osmond Ingram (USS Osmond Ingram (DD-255)/USS Osmond Ingram (AVD-9)/USS Osmond Ingram (APD-35))
 * USS Osmus (USS Osmus (DE-701))
 * USS Osprey (USS Osprey (AM-29), USS Osprey (AM-56), USS Osprey (AM-406), USS Osprey (MHC-51), USS Osprey (AMS-28)/USS Osprey (MSC(O)-28))
 * USS Osprey II (USS Osprey II (SP-928))
 * USS Ossahinta (USS Ossahinta (YT-278)/USS Ossahinta (YTB-278))
 * USS Ossipee (USS Ossipee (1861), USCGC Ossipee (WPG-50))
 * USS Ostara (USS Ostara (AKA-33))
 * USS Osterhaus (USS Osterhaus (DE-164))
 * USS Ostfriesland (USS Ostfriesland (1909))
 * USS Ostrich (USS Ostrich (SP-1249), USS Ostrich (AMc-51), USS Ostrich (AMS-29)/USS Ostrich (MSC(O)-29))
 * USS Oswald (USS Oswald (DE-71), USS Oswald (DE-767))
 * USS Oswald A. Powers (USS Oswald A. Powers (DE-542))
 * USS Oswegatchie (USS Oswegatchie (YTB-515)/USS Oswegatchie (YTM-778))

Ot–Oz

 * USS Otis W. Douglas (USS Otis W. Douglas (SP-313))
 * USS Otokomi (USS Otokomi (YTB-400)/USS Otokomi (YTM-400))
 * USS Otsego (USS Otsego (1840), USS Otsego (1864), USS Otsego (1869), USS Otsego (1919))
 * USS Ottawa (USS Ottawa (1861), USS Ottawa (AKA-101))
 * USS Otter (USS Otter (YFB-663), USS Otter (DE-210))
 * USS Otterstetter (USS Otterstetter (DE-244)/USS Otterstetter (DER-244))
 * USS Ottumwa (USS Ottumwa (YTB-761))
 * USS Otus (USS Otus (AS-20)/USS Otus (ARG-20))
 * USS Ouachita (USS Ouachita (1863))
 * USS Ouachita County (USS Ouachita County (LST-1071))
 * USS Ouellet (USS Ouellet (DE-1077)/USS Ouellet (FF-1077))
 * USS Outagamie County (USS Outagamie County (LST-1073))
 * USS Outpost (USS Outpost (YAGR-10)/USS Outpost (AGR-10))
 * USS Overseer (USS Overseer (AM-321)/USS Overseer (MSF-321))
 * USS Overton (USS Overton (DD-239)/USS Overton (APD-23))
 * USS Overton County (USS Overton County (LST-1074))
 * USS Owachomo (USS Owachomo (YTB-401)/USS Owachomo (YTM-401))
 * USS Owaissa (USS Owaissa (SP-659))
 * USS Owasco (USS Owasco (1861))
 * USS Owatonna (USS Owatonna (YTM-756))
 * USS Owen (USS Owen (DD-536))
 * USS Owera (USS Owera (SP-167))
 * USS Owl (USS Owl (AM-2)/USS Owl (AT-137)/USS Owl (ATO-137), USS Owl (AMCU-35)/USS Owl (MHC-35))
 * USS Owyhee River (USS Owyhee River (LSM(R)-515)/USS Owyhee River (LFR-515))
 * USS Oxford (USS Oxford (APA-189), USS Oxford (AG-159)/USS Oxford (AGTR-1))
 * USS Oyster Bay (USS Oyster Bay (AVP-28)/USS Oyster Bay (AGP-6))
 * USS Ozama (USS Ozama (1916))
 * USS Ozark (USS Ozark (1863), USS Ozark (BM-7), USS Ozark (CM-7)/USS Ozark (AP-107)/USS Ozark (LSV-2)/USS Ozark (MCS-2))
 * USS Ozaukee (USS Ozaukee (ID-3439))
 * USS Ozbourn (USS Ozbourn (DD-846))
 * USS Ozette (USS Ozette (ID-3985), USS Ozette (YTB-541))