Segisaurus
- Pronunciation: SEG-gee-SAWR-us
- Translation: Segi Canyon Lizard
- Order: Saurischia
- Suborder: Theropoda
- Infraorder: Ceratosauria (not confirmed)
- Family: Segisauridae
- Height: 2 feet (0.6 meters)
- Length: 4 feet (1.2 meters)
- Period: Early Jurassic
- Description: Carnivore, Bipedal
- Notes: Found in Segi Canyon, Arizona, Segisaurus was a verysmall predator. The structure of its legs and tail suggest that itwas very swift.