Frederick Adetokumboh M'Cormack (sometimes credited as Adetokumboh McCormack, Frederick McCormack, or Adetokumoh McCormack) is a Sierra Leone Creole actor, known for his roles in the television series Lost and Heroes. McCormack was born in Sierra Leone.

He lived in Nigeria and Kenya before attending SUNY Purchase in New York. He currently resides in Los Angeles. He has appeared in numerous TV-series, and he portrayed a recurring character on Lost as Mr.