Captain Barry Nugent Yelverton, 5th Viscount Avonmore (11 February 1859 – 13 February 1885), was an Anglo-Irish peer and an officer in the 37th Foot, which was renamed as the Hampshire Regiment in 1881.

Yelverton was born at Edinburgh,^[1] the son of William Yelverton (later Lord Avonmore) by his marriage to Emily Marianne Ashworth, the daughter of Major-General Sir Charles Ashworth, who had previously been married to Edward Forbes, a botanist, by whom she had several children. This marriage was not welcome to Yelverton's family.^[2]

He was educated at the Royal Military College, Sandhurst, in Berkshire, and on 30 January 1878 was commissioned into the 37th Foot as a second lieutenant. In February 1879 he was promoted to lieutenant.^[1]

He became a British Army instructor in musketry and died of enteric fever at Kirbekan in 1885, while serving in the Sudan.^[1] A plaque commemorating him can be found in Winchester Cathedral.