Aquilaria crassna is a species of plant in the Thymelaeaceae family.

It is critically endangered and native to Southeast Asia.

[1] Aquilaria crassna is one source[2] of agarwood, a resinous heartwood, used for perfume and incense.

[3] The resin is produced by the tree in response to infection by a parasitic ascomycetous mold, Phaeoacremonium parasitica,[4] a dematiaceous (dark-walled) fungus.

This Thymelaeaceae article is a stub.