Lonchognathosaurus is a genus of dsungaripterid pterodactyloid pterosaur from the Aptian-Albian-age Lower Cretaceous Lianmuqin Formation of Xinjiang, China.

The point of the upper jaw, composed of the premaxilla bones, was slender and had a needle-like tip.

Each maxilla only had eight teeth, and the bottom margin of the upper jaw was straight (unlike in other pterosaurs where it is strongly curved).

The genus was, after a cladistic analysis, classified as a member of the Dsungaripteridae, as the sister taxon to Dsungaripterus.

[3] However, in 2021, postcranial elements referrable to Lonchognathosaurus, confirming the validity of the genus and providing new information on the anatomy of this pterosaur, were described from the Lower Cretaceous Lianmuqin Formation (China) by Augustin et al..[4] Averianov et al., (2022) described a distal fragment of the wing metacarpal from the Lower Cretaceous Barremian-Aptian age Ilek Formation in West Siberia, Russia and identified it as cf.