Aextoxicon is a genus of dioecious[3] trees native to southern Chile and Argentina.

It is the only genus in the monotypic family Aextoxicaceae, and is itself represented by the olivillo (Aextoxicon punctatum).

The fruit is a single seeded drupe that resembles an olive, thus giving the plant its common name.

[5] Aextoxicon punctatum is found in Chile, usually in damp places from the Bosque de Fray Jorge National Park southwards to the Chiloé Archipelago, also in the Valdivian forest and Magellanic forests of the southern Pacific coast.

In Argentina it is present in the middle reaches of the Rio Negro valley, being invasive on the island of Choele Choel,[dubious – discuss] and it is common in the Lago Puelo National Park, Chubut.