Sealab 2020 was a short-lived American animated television series, produced by Hanna-Barbera.

The series was about an underwater research base and had an environmental theme. The series ran on NBC in 1972 and was canceled after screening only thirteen of the sixteen half-hour episodes. The show has not yet been released on DVD. The Milton Bradley Company made a board game about it.

It was later re-edited and dubbed with new voices to form the comedic television series Sealab 2021 that aired on Adult Swim.

The last broadcast was on 1 September 1973.

Gail's pet Dolphin is named Tuffy.