Mobile Suit Zeta Gundam (Japanese: 機動戦士Ζガンダム, Hepburn: Kidō Senshi Zēta Gandamu) is a 1985 Japanese television anime series, the second installment in the Gundam franchise, and a sequel to the original Mobile Suit Gundam. The show was created and directed by Yoshiyuki Tomino, with character designs by Yoshikazu Yasuhiko, while the series' mechanical designs are split among Kunio Okawara, Mamoru Nagano, and Kazumi Fujita. The series was originally aired on Nagoya Broadcasting Network and its sister ANN stations between 1985 and 1986.

The plot is set in the futuristic "Universal Century" timeline and takes place eight years after the events of the original series. Zeta centers on a new conflict that is formed between two new factions - the Titans, a corrupt task force formed by the Earth Federation, and the Anti-Earth Union Group (AEUG), a rebel group that seeks to end the Titans. The show is told through the perspective of Kamille Bidan, a teenage member of the AEUG and pilot of the RX-178 Gundam Mk-II, and later the MSZ-006 Zeta Gundam. Several main characters from the previous Gundam series return in supporting roles, including Amuro Ray and his rival Char Aznable, the latter of which returns as a pilot for the AEUG under the new identity of Quattro Bajeena.

Often regarded as one of the best shows in the franchise, the series is praised for its dark themes, characters, and its improvements over its predecessor. Between 2005 and 2006, the series was reproduced and compiled into a film trilogy, Mobile Suit Zeta Gundam: A New Translation. Though still directed by Tomino, it involved many changes in the original storyline. The films were considered to be a success in Japan.