Winston Joseph Field CMG MBE (6 June 1904 – 17 March 1969) was a British politician who served as the seventh Prime Minister of Southern Rhodesia. Field was a former Dominion Party MP who founded the Rhodesian Front political party with Ian Smith.

Field was born and raised in Bromsgrove and attended Bromsgrove School as a day student, in Worcestershire, England, and moved to Southern Rhodesia at the age of 17 in 1921. A tobacco farmer near Marandellas (now known as Marondera), in Mashonaland East, Field was President of the powerful Rhodesian Tobacco Association from 1938 to 1940, when he left for military service during the Second World War.

Initially enlisting in the Rhodesian Forces as a sergeant, he was court-martialled and demoted to the rank of private for striking a subordinate. Field then transferred to the British Forces, joining the Worcestershire Regiment as a Second Lieutenant from 1941, served in the D-Day Normandy landings in 1944, and ended the war with the rank of Major in the 6th Durham Light Infantry.

Field was first elected to the Federation of Rhodesia and Nyasaland Federal Assembly for Mrewa in a 1957 by-election under the Dominion Party ticket. The Federation Minister of Justice, Julian Greenfield, found him "somewhat impulsive and opinionated but entirely straightforward".^{[citation needed]}

When the Rhodesian Front was founded in early-1962 by Ian Smith and Douglas "Boss" Lilford; a very wealthy right-wing tobacco farmer, they needed an establishment figurehead and Field was chosen. He was a solid, trustworthy figure and no racist, even though "nearly everyone else in the new party was to the right of him". His wife said "he didn't really want to take it on, he wasn't really a political animal".

The "imperious and intolerant" Field was elected, to his and many others' surprise, as Rhodesia's first Rhodesian Front Prime Minister at the 1962 general election and served until he was replaced by Ian Smith in 1964. Field lent an air of respectability to the Rhodesian Front government, though his Cabinet was derided by one newspaper as "by no means an inspiring list". Broader afield, the Australian journal The Bulletin noted of Field that "those who know him best do not for a moment suppose that Winston Field has been slow to attract attention because he is personally diffident or lacking in character. On the contrary, they see him as a man of cold reserve, not softened by his past defeats, not at all intimidated by the terrible power over other men’s lives now put into his hands by the white voters of Southern Rhodesia."

At the time of Field's election, it was assumed that the UK would delay the process of independence for Rhodesia until "an African majority assumed power in Salisbury". Many in the Rhodesian Front felt that Field did not fight hard enough for independence, in particular that the British had hoodwinked him on visits to London in June 1963 and January 1964 over promises of independence. His relatively short tenure in office saw the dissolution of the Central African Federation on 31 December 1963, though he did win the majority of the Federation's military and other assets for Southern Rhodesia.

Field's Cabinet included John Gaunt, a former Federal MP for Lusaka and a former District Commissioner in Northern Rhodesia. Aware of discontent in Cabinet fomented by Gaunt, Field demanded his resignation in the spring of 1964. Gaunt asked him to wait over the weekend whilst he cleared up some matters in his office. In that time, Gaunt and Smith organised a plot against Field, now seen as ineffectual after his failure to win independence. Ken Flower, head of Rhodesia's Central Intelligence Organisation, an organisation Field had ordered be set up, had in fact warned him sometime previously there was a conspiracy against him, involving several of his ministers.