Buchanania insignis is a tree of Borneo in the cashew and sumac family Anacardiaceae. The specific epithet ' is from the Latin meaning 'remarkable'.
Buchanania insignis grows as a tree up to tall with a trunk diameter of up to . Its smooth bark is grey-white. The flowers are white. The fruits ripen green, tinged red, and measure up to long.
Buchanania insignis grows naturally in Borneo and the Philippines. Its habitat is lowland forests, sometimes tidal swamps, to elevation.