Gigan (ガイガン, Gaigan) is a cybernetic alien monster from the Godzilla series that first appeared in the 1972 film Godzilla vs. Gigan.
Gigan resembles a bizarre bipedal cybernetic birdlike creature. He possesses one eye, a metal beak with mandibles beside it, spikes running down his head and neck, three sails on his back, a buzzsaw mounted on his abdomen, and sharp metal hooks for hands and feet. In the Showa era, Gigan is 65 meters tall, 120 meters long, and weighs 25,000 tons. In Godzilla: Final Wars, Gigan is 120 meters tall, 250 meters long, and weighs 60,000 tons.
Gigan's origins are unknown. All that can be inferred is that Gigan was once a purely organic alien creature that was converted into a cyborg by a sentient alien race.