Marjorie Armstrong "Markie" Post (born on November 4, 1950, in Palo Alto, California) is an actress, best known for her 1985–1992 role as public defender Christine Sullivan on the NBC sitcom Night Court, and as bail bonds contractor Terri in The Fall Guy from 1982 to 1985.

Post is the daughter of scientist Richard F. Post who is well-known for his patents in the fields of nuclear fusion, particle accelerators, and electronic and mechanical energy storage. She grew up in Walnut Creek, California, and attended Las Lomas High School where she was a cheerleader. She later earned her Bachelor of Arts from Lewis & Clark College in Portland, Oregon.

Post is married to actor and writer Michael A. Ross, and has two daughters. This is her second marriage. Her first marriage was to Stephen Knox, who she met at Lewis and Clark College.