| Named By: | Robert T. Bakker, Phil Currie & Michael Williams in 1988 |
| Time Period: | Late Cretaceous, 68.5 Ma |
| Location: | North America |
| Size: | Approximately 5.2 meters long for holotype |
| Diet: | Carnivore |
| Fossil(s): | Single skull |
| Classification: | | Chordata | Reptilia | Dinosauria | Saurischia | Theropoda | Tyrannosauridae | |
| Also known as: | | Gorgosaurus lancensis | Deinodon lancensis | Aublysodon lancensis | Albertosaurus lancensis | |
Nanotyrannus ("dwarf tyrant") is a potentially dubious genus of tyrannosaurid dinosaur. It is known only from two specimens (possibly three), which are potentially juvenile specimens of the contemporary genus Tyrannosaurus rex.