Geranosaurus (meaning "crane reptile") is a genus of heterodontosaurid ornithischian dinosaur from the Early Jurassic.

Geranosaurus is known only from crushed fragments of the skull, a single jaw bone with nine tooth stubs and limb elements discovered in the Clarens Formation, South Africa in 1871.

[2] The genus name is derived from Greek geranos, "crane", a reference to the crane-like hind-limb.

[2] Geranosaurus is classified as an ornithischian based on the jaw, probably a heterodontosaurid distinct from Heterodontosaurus[1] but not a heterodontosaurine.

[3] Because of its limited remains, Geranosaurus is generally considered a nomen dubium,[1] but it may be distinct because it has the unique combination of an enlarged dentary caniniform, which is a synapomorphy of Heterodontosauridae, and no post-caniniform diastema, which excludes it from Heterodontosaurinae.