- Thermos bomb
- Theron Moses Rice
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- These Are My Jewels
- Thessalonica (theme)
- Thessaly rebellion (1600)
- Thet Naing Win
- Theta (SIS radio group)
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- Thetford Hoard
- Thetis-class gunboat
- Thetis-class ocean patrol vessel
- Theudebert of Soissons
- Theunissen Commando
- Theveste
- They All Sang "Annie Laurie" (the Song That Reaches Ev'ry Heart)
- They Used Dark Forces
- They shall not pass
- Thian Hee
- Thiaroye Massacre
- Thiaroye massacre
- Thibaud Gaudin
- Thickening agent
- Thielman's Independent Cavalry Battalion
- Thiepval Barracks
- Thiepval Memorial
- Thiepval barracks bombing
- Thierry, Count of Flanders
- Thierry d'Orca
- Thierry de Termonde
- Thiers wall
- Thilawa of Yamethin
- Thillaiyampalam Sivanesan
- Thilo Freiherr von Werthern
- Thimbleby's Tower
- Thimbron
- Thimbron (fl. 324–322 BC)
- Thimbron (fl. 400–391 BC)
- Thin Man (nuclear bomb)
- Thingmen
- Thippiri Tirupathi
- Thirachai Nakwanich
- Third-generation jet fighter
- Third-generation warfare
- Third-rate
- Third Afghan-Mughal War (1555–1561)
- Third Air Force
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- Third Battle of Artois
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- Third Battle of Gao
- Third Battle of Gaza
- Third Battle of Katwa
- Third Battle of Kharkov
- Third Battle of Komárom (1849)
- Third Battle of Krithia
- Third Battle of Manzanillo
- Third Battle of Morlancourt
- Third Battle of Mount Hermon
- Third Battle of Murfreesboro
- Third Battle of Nanking
- Third Battle of Panipat
- Third Battle of Petersburg
- Third Battle of Puebla
- Third Battle of San Juan (1898)
- Third Battle of Seoul
- Third Battle of Topolobampo
- Third Battle of Tucson (1782)
- Third Battle of Tuxpan
- Third Battle of Wonju
- Third Battle of the Aisne
- Third Battle of the Corunna Road
- Third Battle of the Hook
- Third Battle of the Isonzo
- Third Carlist War
- Third Carrier Division
- Third Corps, Army of Northern Virginia
- Third Corps, Army of Tennessee
- Third Country National
- Third Crusade
- Third Encirclement Campaign
- Third Encirclement Campaign against Jiangxi Soviet
- Third Encirclement Campaign against the Honghu Soviet
- Third Encirclement Campaign against the Hubei-Henan-Anhui Soviet
- Third Encirclement Campaign against the Shaanxi-Gansu Soviet
- Third Enemy Offensive
- Third English Civil War
- Third Expedition of Wadi al Qura
- Third Fernandine War
- Third Field Army
- Third Fitna
- Third Fleet
- Third Fleet (Imperial Japanese Navy)
- Third Fleet (United Kingdom)
- Third Force (Northern Ireland)
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- Third Geneva Convention
- Third Indochina War
- Third Italian War of Independence
- Third Javanese War of Succession
- Third Legion
- Third Macedonian War
- Third Military District
- Third Military Medical University
- Third Mithridatic War
- Third Mongol invasion of Poland
- Third Perso-Turkic War
- Third Punic War
- Third Raid on Banu Thalabah
- Third Rebellion in Shouchun
- Third Reserve Army of Observation
- Third Sacred War
- Third Sea Lord
- Third Servile War
- Third Siege of Babylon (309 BC)
- Third Siege of Gibraltar
- Third Siege of Girona
- Third Siege of Missolonghi
- Third Silesian War
- Third Swedish Crusade
- Third Taiwan Strait Crisis
- Third Tikal–Calakmul War
- Third Transjordan attack
- Third Treaty of San Ildefonso
- Third United States Army
- Third Upper Peru campaign
- Third VA-155 (U.S. Navy)
- Third VA-34 (U.S. Navy)
- Third VA-95 (U.S. Navy)
- Third World
- Third attack on Anzac Cove
- Third conflict in the Goryeo–Khitan War
- Third country national
- Third encirclement campaign against the Honghu Soviet
- Third encirclement campaign against the Hubei–Henan–Anhui Soviet
- Third sergeant
- Third voyage of James Cook
- Third warrant officer
- Thirlwall Castle
- Thirsk Road drill hall, Northallerton
- Thirteen Colonies
- Thirteen Years' War
- Thirteen Years' War (1454–1466)
- Thirteenth Air Force
- Thirteenth Amendment to the Constitution of Sri Lanka
- Thirteenth Army
- Thirteenth Army (Japan)
- Thirteenth Siege of Gibraltar
- Thirtieth Army (Japan)
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- Thirty-Three Orientals
- Thirty Comrades
- Thirty Seventh SS-Abschnitt
- Thirty Six Stratagems
- Thirty Tyrants (Roman)
- Thirty Years' War
- Thirumayam Fort
- This Is Camp X-Ray
- This Is What Winning Looks Like
- This Way for the Gas, Ladies and Gentlemen
- This is Korea
- Thisara Samarasinghe
- Thiufa
- Thlocklo Tustenuggee
- Thom Goolsby
- Thom Karremans
- Thom McKee
- Thomas' Legion
- Thomas, Lord of Coucy
- Thomas-Alexandre Dumas
- Thomas-Antoine de Mauduit du Plessis
- Thomas-Emil von Wickede
- Thomas-Morse MB-1
- Thomas-Morse MB-2
- Thomas-Morse MB-3
- Thomas-Morse MB-4
- Thomas-Morse MB-6
- Thomas-Morse MB-7
- Thomas-Morse MB-9
- Thomas-Morse O-19
- Thomas-Morse R-5
- Thomas-Morse S-4
- Thomas-Morse TM-24
- Thomas-Morse XP-13 Viper
- Thomas A. Aldrich
- Thomas A. Benes
- Thomas A. Bird
- Thomas A. Blasdel
- Thomas A. Boyd
- Thomas A. Budd
- Thomas A. Bussiere
- Thomas A. Cropper
- Thomas A. Cullinan
- Thomas A. Davis
- Thomas A. Drake
- Thomas A. Morris
- Thomas A. Pope
- Thomas A. Schwartz
- Thomas A. Scott
- Thomas A. Wornham
- Thomas Abel Brimage Spratt
- Thomas Acton (British Army officer)
- Thomas Adair Butler
- Thomas Adams (British Army officer)
- Thomas Adams (Indian Army officer)
- Thomas Adams (classicist)
- Thomas Adams Smith
- Thomas Adamson (master gunner)
- Thomas Adamson (soldier)
- Thomas Addis Emmet
- Thomas Agar-Robartes
- Thomas Aguiyi-Ironsi
- Thomas Aird (British Army officer)
- Thomas Akers
- Thomas Albert McFarlane
- Thomas Alderson
- Thomas Alexander Harris
- Thomas Alexander Irvine
- Thomas Alexander Parrott
- Thomas Alfred Davies
- Thomas Alfred Jones
- Thomas Alfred Smyth
- Thomas Algeo Rowley
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