| Named By: | Swinton in 1930 |
| Time Period: | 199-195 Ma Early Jurassic |
| Location: | England - Blue Lias Formation. |
| Size: | Up to 4.5 meters long |
| Diet: | Piscivore |
| Fossil(s): | One individual |
| Classification: | | Chordata | Reptilia | Sauropterygia | Plesiosaura | Pliosauroidea | Rhomaleosauridae | |
Macroplata (meaning "big plate") is an extinct genus of Early Jurassic basal plesiosaur which grew up to 4.5 metres (15 ft) in length. Like other plesiosaurs, Macroplata probably lived on a diet of fish, using its sharp needle-like teeth to catch prey. Its shoulder bones were fairly large, indicating a powerful forward stroke for fast swimming. Macroplata also had a relatively long neck, twice the length of the skull, in contrast to pliosaurs.
Plesiosaurus longirostris was once assigned to this genus, but it has been re-assigned to Hauffiosaurus, as H. longirostris.