Duncan James Jessiman, QC (June 5, 1923 – April 19, 2006) was a Canadian lawyer and Senator.
During World War II, he served with the Royal Canadian Navy and was discharged with the rank of Lieutenant in 1945.
From 1948 to 1971, he practiced law with the firm of Johnston, Jessiman & Gardner.
In 1993, he was appointed to the Senate by Brian Mulroney and represented the senatorial division of Manitoba.
He was married to Alix and had three children: Duncan, Robert, and Sally.