- Length
- 9.7 m
- Weight
- 2.7 tonnes
- Diet
- Meat-eaterStegosaurus, Diplodocus and others
- Walked
- On 2 legs
- When
- Late Jurassic152 to 145 million years ago
- Fossils found in
- USA
- Named by
- Marsh (1877)
- Family tree
- Dinosauria › Saurischia › Theropoda › Allosauridae
Large theropods. Big two-legged meat-eaters, such as Tyrannosaurus. See all 63
Lived at the same time
- Apatosaurus · same country
- Barosaurus · same country
- Brachiosaurus · same country
- Camptosaurus · same country
- Ceratosaurus · same country
- Coelurus · same country
- Diplodocus · same country
- Dryosaurus · same country
Other large theropods
- Ceratosaurus Late Jurassic
- Elaphrosaurus Late Jurassic
- Marshosaurus Late Jurassic
- Saurophaganax Late Jurassic
- Metriacanthosaurus Late Jurassic
- Yangchuanosaurus Late Jurassic
- Becklespinax Early Cretaceous
- Piatnitzkysaurus Late Jurassic
Source: Allosaurus in the Natural History Museum Dino Directory, read 12 November 2026. Sizes are the museum's estimates for a typical adult. "Lived at the same time" lists dinosaurs whose dates overlap, which does not always mean they met.