Lloyd Cleworth Stinson (February 29, 1904 – August 28, 1976) was a politician in Manitoba, Canada, and the leader of that province's Co-operative Commonwealth Federation (CCF) from 1953 to 1959.
Stinson was defeated in Winnipeg South Centre in the federal election of 1945, though coming a respectable second to the victorious Liberal candidate.
Stinson was the only CCF candidate elected in Winnipeg South that year; he came very close to outpolling longtime Liberal-Progressive cabinet minister John Stewart McDiarmid for first position on the first count.
He was acclaimed as the official party leader on April 25, 1953, by the CCF council, and was subsequently confirmed without opposition by a provincial convention.
The CCF had little choice but to support Roblin's legislation, thereby giving the Tories the record they needed to win another election the following year.
The CCF fell to ten seats in the 1959 election, and Stinson was personally defeated by Tory candidate Obie Baizley.
During Stinson's time as party leader, the CCF was unable to make significant inroads beyond its urban support base (though future Premier Ed Schreyer was elected in a rural constituency).
The party made limited gains in the late 1950s, however, and was poised to become the official opposition (if Liberal support continued to decline).
In 1962, Stinson ran as an NDP candidate in Wellington (north-west Winnipeg), but lost to Tory Richard Seaborn by about 200 votes.