| Named By: | E. Tschopp & O. V. Mateus in 2012 |
| Time Period: | Late Jurassic, 155 Ma |
| Location: | USA, Wyoming |
| Size: | Roughly about 15 meters long, though only the skull and some cervical vertebrae have survived a fire at the American Museum of Natural History |
| Diet: | Herbivore |
| Fossil(s): | Skull and Cervical (neck) vertebrae. Other fossils once collected were destroyed in a fire |
| Classification: | | Chordata | Reptilia | Dinosauria | Sauropodomorpha | Diplodocidae | Diplodocinae | |
Kaatedocus is a genus of diplodocine flagellicaudatan sauropod known from the middle Late Jurassic (Kimmeridgian stage) of northern Wyoming, United States. It is known from well-preserved skull and cervical vertebrae which were collected in the lower part of the Morrison Formation. The type and only species is Kaatedocus siberi, described in 2012 by Emanuel Tschopp and Octavio Mateus.