Michael S. Vartan (born November 27, 1968) is a French-American actor, known for his TV roles as Michael Vaughn on the ABC television action drama Alias, George Helen's on Bates Motel, James Walker on Big Shots, Terence Hoffman on the E! drama The Arrangement, and Dr. Tom Wakefield on the TNT medical drama Hawthorne. His best known film roles are as Sam Coulson in Never Been Kissed, Kevin Fields in Monster-in-Law, and Kevin Lassiter in The Next Best Thing.

His other film roles include The Pallbearer, One Hour Photo, Rogue, Colombiana, and Small Town Crime. He played the role of Lancelot in TNT's production of Marion Zimmer Bradley's The Mists of Avalon (2001).