The white-headed marmoset (Callithrix geoffroyi), also known as the tufted-ear marmoset, Geoffroy's marmoset, or Geoffrey's marmoset, is a marmoset endemic to forests in eastern Brazil, where it is native to Bahia, Espírito Santo, and Minas Gerais, and introduced to Santa Catarina.

[2] It is known as the sagüi or sauim in Brazil.

[3] Its diet consists of fruits, insects, and the gum of trees.

[4] It is a host of Pachysentis lenti an acanthocephalan intestinal parasite.

[5] This New World monkey-related article is a stub.