Maasia is a genus of flowering plants belonging to the family Annonaceae.

[1] Its native range is Indo-China to New Guinea.

It is found in Andaman Islands, Borneo, Java, Malaya, Maluku Islands, Myanmar, Nicobar Islands, Philippines, Sulawesi, Sumatera and Thailand.

[1] The genus name of Maasia is in honour of Paul Maas (born 1939), a botanist from the Netherlands and a specialist in the flora of the neotropics.

[1] The name Mosannona Chatrou (1998), Annonaceae, was also named after him.