Jean Désy (French pronunciation: [ʒɑ̃ dezi]; January 8, 1893 – December 19, 1960) was a Canadian diplomat.
Born in Montreal, Quebec, he studied law at Université Laval and the Sorbonne in Paris.
In January 1939 Désy was appointed Canada's first ambassador to Belgium and the Netherlands, and the first envoy to Brazil in June 1941.
In January 1952 he was seconded by the government to direct the Canadian Broadcasting Corporation's International Service (later Radio Canada International) to remove what was perceived as a left-wing bias in its reporting.
Désy finished his career in Paris as ambassador to France 1954-57, where he died in 1960.