Mark John Geragos (born October 5, 1957) is an American criminal defense attorney best known for defending the musician Michael Jackson, actress Winona Ryder, politician Gary Condit, and Susan McDougal, who was involved in the Whitewater scandal. He also represented Scott Peterson, in another trial that received widespread media attention. He's currently representing Paul and Kuhlbir Dhaliwal, two brothers injured after a tiger escaped in San Francisco Zoo, and pop superstar Chris Brown, accused of assaulting Grammy award winning entertainer Rihanna. He is considered a "celebrity lawyer".

Geragos (born Geragosian) was born in Los Angeles, California. He received his bachelor's degree from Haverford College in 1979 and his Juris Doctor (J.D.) from Loyola Law School in 1982. He was admitted to the California State Bar in 1983. Currently, Geragos is the managing partner at The Law Offices of Geragos and Geragos, a 13-person law firm in Los Angeles.

An Armenian-American, Geragos maintains a close relationship with the Armenian community. He has earned praise from the Armenian National Committee of America He serves on the Advisory Committee of Birthright Armenia, as the chairman of Armenian Bone Marrow Donor Registry, and also is involved in the religious aspect of the Armenian community. He has been a member of the Armenia Fund International Board of Trustees since 2006.