Captain Lockhart Leith CMG DSO RN (2 June 1876 – 30 November 1940) was a British fencer and Royal Navy officer. He competed in the individual sabre event at the 1908 Summer Olympics.^[1][2]

Leith was the son of Walter Leith JP of Ashby-de-la-Zouch. He was educated at Burney's Royal Naval Academy, Gosport and joined HMS Britannia in 1890. He was promoted to lieutenant on 30 September 1898, and among his early postings was a temporary posting to HMS Duke of Wellington in 1902.^[3] The following year he took a course of gymnastic training at Aldershot.^[4] In 1904 he was appointed in command of the tbd HMS Dasher. He was promoted to commander on 31 December 1910 and captain on 31 December 1916.^[5]

Leith served with distinction during the First World War. He was awarded the Distinguished Service Order in 1917^[6] and appointed a Companion of the Order of St Michael and St George in the 1919 New Year Honours.^[7] He was awarded the Navy Cross from the United States in 1920^[8] and retired in 1922.^[5]

Leith died in 1940 after an operation and was survived by his wife Norah (née Barry).^[9]