Science Ninja Team Gatchaman (科学忍者隊ガッチャマン, Kagaku Ninja-tai Gatchaman, lit. Science Ninja Squad Gatchaman) is a Japanese animated franchise about a five-member superhero ninja team created by Tatsuo Yoshida and produced by Tatsunoko Productions. The original anime series, which debuted in 1972, was eponymously entitled Kagaku Ninja-tai Gatchaman and is best known in the English-speaking world as the adaptation entitled Battle of the Planets (1978). The series had additional English adaptations with G-Force: Guardians of Space (1986) and ADV Films' uncut 2005 release. Tatsunoko also uses the official translation Science Commando Gatchaman in related products and media.

The original Kagaku Ninja-tai Gatchaman series was followed by an animated film and two direct sequel series, Gatchaman II (1978) and Gatchaman Fighter (1979). During the 1990s, episodes from both series were dubbed into English by Saban as Eagle Riders.

In the years since, the franchise has spawned many different productions, some that were left unproduced or evolved significantly from its development. This includes a 1994 original animated video remake, an unproduced 1998 television remake, a cancelled 2011 animated film reboot by Imagi Animation Studios, a 2013 Japanese live-action film reboot by Nikkatsu Studios, various spinoffs, re-imaginings, and merchandise.