Assignment: Underwater is an American adventure television series which aired in NTA Film Network syndication from 1960 to 1961.
The series stars prolific B-movie actor Bill Williams and Diane Mountford. Williams played Bill Greer, the skipper aboard a charter boat named The Lively Lady. Mountford played his daughter, Patty.
The series was written and produced by Frank De Felitta for Liberty Enterprises and National Telefilm Associates.