John Rissler "Jack" Messer (born May 26, 1941) is a farmer and former political figure in Saskatchewan.
He represented Kelsey from 1967 to 1971, Tisdale-Kelsey from 1971 to 1975 and Kelsey-Tisdale from 1975 to 1980 in the Legislative Assembly of Saskatchewan as a New Democratic Party (NDP) member.
He was born in Tisdale, Saskatchewan,[1] the son of William Frederick Messer and Margaret Elizabeth Rissler, and was educated there and in Vancouver, British Columbia.
[2] He was secretary of the Tisdale Wheat Pool Committee and a director for the Evington Rural Telephone Company.
Messer has also served as a director for Ducks Unlimited Canada and was the organizations' president from 2003 to 2004.