Mobile Suit Gundam SEED (Japanese: 機動戦士ガンダムSEED(シード), Hepburn: Kidō Senshi Gandamu Shīdo) is an anime series developed by Sunrise and directed by Mitsuo Fukuda. The ninth installment in the Gundam franchise, Gundam SEED takes place in a future calendar era, in this case the Cosmic Era. In this era, mankind has developed into two subspecies: Naturals, who reside on Earth, and Coordinators, genetically enhanced humans capable of amazing feats of intellect who emigrate to man-made orbital colonies to escape persecution by natural humans. The story revolves around a young Coordinator Kira Yamato who becomes involved in the war between the two races after a third, neutral faction's space colony is invaded by the Coordinators.

The television series was broadcast in Japan between 2002 and 2003, on the Tokyo Broadcasting System Television and MBS TV networks, beginning a broadcast partnership with the Gundam franchise. The series spawned three compilations films and was adapted into a manga as well as light novels. A sequel series, Mobile Suit Gundam SEED Destiny followed in 2004 and a followup film, Mobile Suit Gundam SEED Freedom was released in 2024. Merchandise has been released, including models, CD soundtracks and video games. Gundam SEED was licensed by Bandai Entertainment for broadcast in North America, and began airing in the United States and Canada in 2004. The films and the sequel were also licensed by Bandai. The manga and light novels as well as the spin-off series, Mobile Suit Gundam SEED Astray, were licensed. Video games were released in North America. In 2011, a HD remaster of the series consisting of 48 episodes was released.

Mobile Suit Gundam SEED was widely popular with the public in Japan, winning numerous awards, with high sales of the series DVD and music. It was also a critical success with writers focusing on the character development and animation especially the leads. However, similarities with previous Gundam series were noted.