Oscar Montague Guest (24 August 1888 – 8 May 1958)[1] was a politician in the United Kingdom, initially with the Liberal Party and later as a Conservative.
He was the youngest of the nine children of Ivor Bertie Guest, 1st Baron Wimborne (1835–1914) and his wife Lady Cornelia Henrietta Maria Spencer-Churchill (1847–1927), daughter of John Spencer-Churchill, 7th Duke of Marlborough, aunt of Sir Winston Churchill.
He was married on 19 January 1924 to Kathleen Susan Paterson (1902–1981),[2] and they had four children: two sons and two daughters, Bertie (1925–2007), Patrick (1927–2016), Cornelia (1928– ) and Revel (1931–2022).
At the 1945 general election, he did not contest the Camberwell seat (which was won by the Labour Party candidate), but stood instead in the Breconshire and Radnorshire constituency, where his nephew Ivor had been MP in the 1930s.
Oscar was defeated there, ironically by a much wider margin than the Labour majority in Camberwell North West.