The Secrets of Isis, originally broadcast as Isis, is an American live-action superhero television series produced by Filmation from 1975 to 1976 for CBS's Saturday morning lineup. The series was renamed The Secrets of Isis in syndication.The program was the first weekly American live-action television series with a female superhero lead character, debuting on September 6, 1975, predating the weekly debuts of both The Bionic Woman (January 14, 1976) and Wonder Woman (April 21, 1976). In the series, Isis (Joanna Cameron) is the alter ego of Andrea Thomas, a seemingly normal schoolteacher, who transforms into the Egyptian goddess when presented with crises a mere mortal cannot resolve.

Episodes of the series featured crossovers featuring Captain Marvel from the companion series, Shazam!. Likewise, Joanna Cameron appeared as Isis on Shazam! in return; since then DC Comics has adopted the character of Isis into their mainstream continuity for modern comics.