Choconsaurus ("El Chocón lizard") is an extinct genus of herbivorous sauropod dinosaur belonging to the group Titanosauriformes, which lived in the area of present-day Argentina at the end of the Cretaceous.

[1] The holotype (specimen MMCh-PV 44/10) was found in Villa El Chocón in Neuquén province, Argentina by Viviana Moro before 1996.

[1] Subsequent field campaigns carried out at Manuel Bustingorry's "Bustingorry II" site by the Ernesto Bachmann Paleontological Museum and the Museum of Geology and Paleontology of the National University of Comahue between 1996 and 2002 discovered more remains pertaining to Choconsaurus, with several of the specimens described by Calvo (1999) under "Titanosauridae indet.

[3] In 2017, the species type Choconsaurus baileywillisi was named and described by Edith Simón, Leonardo Salgado and Jorge Orlando Calvo.

For its part, the name of the species is in homage to the American geologist Bailey Willis, who traced the stratigraphy of the area between 1910 and 1914.