Marcus Bertram Simon (born July 1, 1970) is an American lawyer and politician from Virginia. A member of the Democratic Party, Simon is the member of the Virginia House of Delegates for the 13th district, which includes Falls Church and parts of Fairfax County. His committee assignments include: Finance; Courts of Justice; Public Safety; and Communications, Technology and Innovation. He serves as Democratic Floor Leader for the House Democratic Caucus. He is appointed to the Freedom of Information Advisory Council. Simon was one of the eight legislators appointed to the 2021 Virginia Redistricting Commission, along with eight citizen members. As a lawyer, Simon was a member of the Judge Advocate General's Corps of the United States Army and currently owns his own law firm.