| Named By: | Gaudry in 1886 |
| Time Period: | Late Carboniferous - Early Permian, 299-296.4 Ma |
| Location: | England - Kenilworth Sandstone Formation. France. Germany - Dohlen Formation, Niederhaslich-Schweinsdorf Formation. Poland - Ludwikowice Formation. USA, Kansas - Stanton Formation |
| Size: | Between 70 and 150 centimetres long depending upon the species. Smaller species such as H. garnettensis about 70 centimetres, while larger species like H. baylei about 140 centimetres long |
| Diet: | Insectivore/Carnivore |
| Fossil(s): | Several individuals |
| Classification: | | Chordata | Synapsida | Pelycosauria | Sphenacodontia | |
| Also known as: | | Callibrachion Datheosaurus | Palaeohatteria | Pantelosaurus | |
Haptodus is an extinct genus of basal sphenacodont, a clade that includes therapsids and hence, mammals. It was at least 1.5 metres (5 ft) in length. It lived from Latest Carboniferous to Early Permian. It was a medium-sized predator, feeding on insects and small vertebrates. H. garnettensis is currently the basalmost sphenacodontian.