Nichollsemys is a genus of extinct sea turtles.

The name of Nichollsemys is a tribute to Elizabeth Nicholls, a paleontologist from Canada who studied marine reptiles from the Triassic period.

She had previously done work with Brinkman when they found the ichthyosaur genus Parvinatator.

[4] †Toxochelys †Protostegidae †Corsochelys Dermochelyidae †Nichollsemys †Allopleuron Cheloniidae †Argillochelys †Procolpochelys †Eochelone †Puppigerus †Ctenochelys †Peritresius †Cabindachelys The full length of the Nichollsemys is unknown, but Brinkman made a chart of the length of some parts of the specimen.

[5] The cranium has many things in common with that of Toxochelys: for example, they both have a rostrum basisphenoidale shaped like a rod.