Thililua is a genus of polycotylid plesiosaur, containing one species, T. longicollis.

The name Thililua is derived from that of an ancient aquatic god from local Berber mythology; longicollis refers to the animal's long neck.

Thililua has been found in Late Cretaceous (early Turonian) rocks in the High Atlas mountains of Morocco in north Africa.

[2] The type specimen of T. longicollis, which was described in 2003, consists of an almost complete skull and lower jaw, articulated with 37 vertebrae.

It is believed to be an adult specimen, since some of the cranial sutures are very difficult to distinguish.