Mark Shields (b. May 25, 1937 in Weymouth, Massachusetts) is an American political pundit appearing frequently on CNN and PBS as a liberal commentator.

Shields graduated from the University of Notre Dame in 1959. He served a stint in the United States Marine Corps before beginning his career in Washington, DC in 1964. In fact, he has had two distinct careers over the last forty years.

The first career for Shields was as a Washington insider. Originally he was a legislative assistant to Senator William Proxmire of Wisconsin. By age 31, he was running Robert Kennedy's California campaign for president in 1968 (see U.S. presidential election, 1968). He later worked on presidential campaigns for Democrats Sargent Shriver and Edmund Muskie.

After 15 years, Shields transitioned into the media. He joined the editorial board of the Washington Post in 1979. The next year, he began writing a column that is now syndicated nationally. Additionally, Shields has appeared on television, first on the McNeil/Lehrer Report and Evans, Hunt, Novak, & Shields on CNN.