William Napier, 13th Lord Napier

Lt. Col. William Francis Cyril James Hamilton Napier, 13th Lord Napier, 4th Baron Ettrick DL (9 September 1900 – 23 August 1954) was a Scottish soldier and courtier.

Early life He was the eldest son of Francis Napier, the 12th Lord Napier and his wife Hon. Clarice Jessie E. Hamilton, daughter of James Hamilton, 9th Lord Belhaven and Stenton. His brother, Hon. Neville Archibald John Watson Ettrick Napier, married Eileen Thorne (daughter of Hubert Prangley Thorne), in 1937.

He was educated at Wellington College and Sandhurst.

Upon his father's death in 1941, he succeeded as Lord Napier and Ettrick and as chief of the name and arms of Clan Napier. Hon. John Greville Napier (1939–1988), who married Juliet Elizabeth Hargreaves Durie, daughter of Sir Alexander Charles Durie and Joyce May Hargreaves, in 1968. Hon. Hugh Lennox Napier (1943–1996), a doctor who died unmarried.

Lord Napier died on 23 August 1954 and was succeeded by his eldest son, Nigel.