Robin Thomas is an American film, television and theater actor, and sculptor, best known for his role as Kalabar in the seminal Disney Channel Original Movie Halloweentown.

Thomas' best-known television roles are as Mark Singleton on Another World (1983–85), and as Geoffrey Wells on Who's the Boss?. He also portrayed Paul Kellogg on The Mommies, Nate's father on Life Unexpected, and had recurring roles on the television series Murphy Brown, Hunter, Matlock, Thirtysomething, Baby Boom, The Division, Switched at Birth, and 90210.

He has also appeared on Misfits of Science, Midnight Caller, Party of Five, Walker, Texas Ranger, Pacific Blue, Queer as Folk, NCIS, NCIS: Los Angeles, CSI: Crime Scene Investigation, CSI: Miami, CSI: NY, Criminal Minds, Desperate Housewives, Franklin & Bash, Castle, Manhattan, Fuller House, Transparent, Blue Bloods, and Crazy Ex-Girlfriend, among others.

He also appeared in such films as About Last Night..., Summer School, The Contender, The Banger Sisters, Pacific Rim, and Seberg.

Thomas spent his early years in New York as a carpenter, specializing in renovations of restaurants and apartments.