Phrynops geoffroanus, also commonly known as Geoffroy's side-necked turtle and Geoffroy's toadhead turtle, is a species of large side-necked turtle in the family Chelidae.

The specific name, geoffroanus, is in honor of French naturalist Étienne Geoffroy Saint-Hilaire.

[4] P. geoffroanus is found in southwestern Venezuela, southeastern Colombia, eastern Ecuador, and eastern Peru, southward and eastward through southwestern Brazil and northern Bolivia to Paraguay and northeastern Argentina, then northward through eastern Brazil.

[5] It also occurs in eastern Venezuela,[5] and in adjacent Guyana.

[citation needed] The prferred natural habitat of P. geoffroanus is freshwater rivers.