Sir Joseph Napier, 4th Baronet

Sir Joseph William Lennox Napier, 4th Baronet of Merrion Square, (1 August 1895 – 13 October 1986), was a British baronet and soldier in both World War I including the Gallipoli Campaign and World War II.

He married Isabelle Muriel Surtees (daughter of Major Henry Surtees) on 12 February 1931.

He succeeded to the Baronetage of Merrion Square in 1915 on the death of Sir William Napier, 3rd Baronet (1867–1915), and was succeeded by Sir Robert Surtees Napier, 5th Baronet (1932–1994).