Oolithes is an oogenus with uncertain affinities.

It has historical significance because it was the earliest named oogenus.

James Buckman described the first named species as Oolithes bathonicae in a communication to the 4 May 1859 meeting of the Geological Society (published in 1860).

Buckman believed that Oolithes represented the eggs of a teleosaurian reptile.

[1] Since Buckman's description of O. bathonicae, two other oospecies have been named: O. nanhsiungensis and O. spheroides, both of which were native to the Maastrichtian of China.