Judith Seidman (born September 1, 1950) is a Canadian medical researcher and politician. She was named to the Senate of Canada as a Conservative on August 27, 2009. She served until her mandatory retirement in 2025, on her 75th birthday.
Seidman was the Quebec co-chair of Stephen Harper's 2004 leadership campaign.
She is an epidemiologist and social worker by profession as well as a researcher and adviser in the health and social services fields.
Seidman is Jewish.