Llanocetus (“Llano's whale”) is a genus of extinct baleen whales from the Priabonian (Late Eocene) of Antarctica. Its fossilized remains were discovered on Seymour Island in the Antarctic Peninsula, within La Meseta Formation. Mitchell created for the specimen the new monotypic family Llanocetidae, as well as the new monotypic genus Llanocetus and the species L. denticrenatus. The three new taxa were dedicated to the American biologist George A. Llano.