Elaltitan is an extinct genus of large lithostrotian titanosaur sauropod dinosaur known from the Late Cretaceous (mid Cenomanian to Turonian stage) of Chubut Province, southern Argentina.

It came from the lower member of the Bajo Barreal Formation, dating to the middle Cenomanian to the Turonian stage of the Late Cretaceous period, about 96.5-89.3 million years ago.

The autapomorphy (unique trait) is the presence of dorsoventrally tall neural arch restricted to anterior half of centrum (excluding condylar ball) in anterior-most caudal vertebrae.

Other unusual characters include a spinopostzygapophyseal laminae in middle–posterior dorsal vertebrae bifurcate into medial and lateral branches, an astragalar ascending process that does not extend to the posterior margin of the astragalus and the presence of a calcaneum.

These traits distinguish Elaltitan from all other titanosauriforms, including Antarctosaurus and Argyrosaurus, as well as other sauropods from the lower member of the Bajo Barreal Formation, such as Drusilasaura and Epachthosaurus.