Lacusovagus (meaning "lake wanderer") is a genus of azhdarchoid pterodactyloid pterosaur from the Lower Cretaceous of Brazil. It is based on SMNK PAL 4325, a partial rostrum comprising sections of the skull anterior to the eyes. This specimen was found in rocks of the Early Cretaceous-age (Aptian?) Nova Olinda Member of the Crato Formation. The skull was long, and unusual in its relative width, relatively short section anterior to the combined nasal-antorbital fenestra, and combination of toothless jaws and no bony head crest. Lacusovagus was described in 2008 by Mark Witton. The type species is L. magnificens. To date, it is the largest known Crato Formation pterosaur.