John Hussey Hamilton Vivian, 4th Baron Swansea, CStJ, DL (1 January 1925 – 27 June 2005), was a British peer, sports shooter and lobbyist.

He resigned the Conservative whip in protest at restrictions on firearms ownership passed in response to the Hungerford and Dunblane mass shootings.

He was one of five shooters to captain a team in each of the "Big Five" international matches: the National, Mackinnon, Kolapore, Australia and Palma.

He was married twice, and was succeeded upon his death in 2005 by Richard Anthony Hussey Vivian, his son from his first marriage.

[2] Swansea was educated at Eton College, where he shot for the school at Bisley in the Ashburton Shield and worked during the Second World War making pivots for anti-tank guns.

[9] He lobbied against legislation drawn in the aftermath of the Hungerford and Dunblane mass shootings (in 1987 and 1996 respectively), including a ban on the private possession of pistols, passed as the Firearms (Amendment) Act 1988.

[1] Commenting on Swansea's remarks during the second reading of what became the Act, the New Law Journal called him the "most ardent spokesman" for the shooting lobby, while also characterising his speech as "containing rather more hyperbole than is usual in the Lords".

[9] He was a member of eight touring Great Britain teams and was one of five shooters to captain each of the "Big Five" international matches – the National, Mackinnon, Kolapore, Australia and Palma.

[1] Swansea was president of the Cambridge University Long Range Rifle Club,[18] and a long-time captain of the House of Lords shooting team,[19] which was forced to shut down following the gun control legislation of the 1980s and 1990s.

[20] They had two daughters and, in 1957, a son, Richard Anthony Hussey Vivian, who later succeeded to the title of Baron Swansea.

[8] In 1966, Swansea sold Caer Beris [cy], the family's ancestral seat near Builth Wells in Powys;[1] by the late 1960s, he was living primarily in London.