Prasoxylon rigidum is a tree in the family Meliaceae. The specific epithet ' is from the Latin meaning 'rigid', likely referring to the leaflets.
The tree grows up to tall with a trunk diameter of up to . The bark is reddish-grey and when slashed releases an onion-like scent. The fruits are pink to purplish-brown, roundish, up to in diameter.
Prasoxylon rigidum is found in Sumatra, Peninsular Malaysia and Borneo. Its habitat is lowland rain forest from sea-level to elevation.