John Peavey (born September 1, 1933) is a rancher and Democratic politician from Carey, Idaho. Peavey served in the Idaho Senate from 1969 to 1976 and from 1978 to 1994.

From a young age Peavey worked on the ranch founded by his grandfather, U.S. Senator John Thomas. In 1969 he succeeded his mother, Mary Brooks in the Idaho Senate as a Republican after she was appointed director of the United States Mint by President Richard M. Nixon.

In 1974, after repeated attempts to pass a Sunshine Law; a law requiring lobbyists to register and political campaign disclosure, in the legislature were unsuccessful, Peavey led a successful statewide campaign to pass one by ballot initiative.^{[citation needed]}

In 1994 Peavey was the Democratic nominee for lieutenant governor. He was defeated by the Republican incumbent Butch Otter, who was later elected governor in 2006.^[1]