Notochelone is an extinct genus of sea turtle, which existed about 100 million years ago.

[1] The species was first described by Richard Owen in 1882 as Notochelys costata.

[2][3] It was the most common marine reptile living in the inlands of the sea around Queensland, Australia.

[4] It was small turtle with carapace less than 1 metre (3.3 ft).

[5][1] Analytical studies have indicated that the creatures frequently ate benthic molluscs.