Thinornis is a genus of plovers in the family Charadriidae.
The genus Thinornis was introduced in 1844 by the English zoologist George Robert Gray to accommodate a single species, Thinornis rossii G.R. Gray, which is now considered a junior synonym of Charadrius novaeseelandiae J.F. Gmelin, the shore plover. The genus name combines the Ancient Greek this meaning "beach" or "sand" with ornis meaning "bird". Genetic studies have shown that Thinornis is sister to the genus Charadrius.
The genus contains seven species:
An additional species, the Auckland Islands shore plover (Thinornis rossii), known from just one specimen collected in 1840, is now generally considered to be a juvenile shore plover whose location was incorrectly recorded.