William Leonard Frank Holmes à Court, 5th Baron Heytesbury of Heytesbury (17 April 1906 – 27 November 1971) was a British landowner and peer, serving as a Member of the House of Lords from 1949 until 1971. 
Early life.
The son of Leonard Holmes à Court, 4th Baron Heytesbury, and his wife Sybil Mary Morris, a daughter of Captain Frank B. Morris, the young Holmes à Court was educated at Pembroke College, Cambridge. 
Career.
Holmes à Court succeeded as the 5th Baron Heytesbury of Heytesbury, and as a baronet, on 2 February 1949. He was a member of the House of Lords from then until his death in 1971.
Personal life.
On 11 May 1926, Holmes à Court married Beryl Crawford, a daughter of Dr Albert Edward Bredin Crawford. They had an only child, Francis Holmes à Court, 6th Baron Heytesbury (1931–2004), who in 1971 succeeded to the peerage and baronetage.