Monoon is a genus of about 80 species of lowland tropical trees in the family Annonaceae, within the tribe Miliuseae. Species have been recorded from the Indian subcontinent, Indochina, Malesia through New Guinea, the Solomon Islands, and northern Australia. The genus was resurrected out from Polyalthia following a molecular study showing the two genera as not immediately related.
, Plants of the World Online accepts the following 75 species: