Metroxylon amicarum (amicarium Latin – 'of friends' also known as the Caroline ivory-nut palm) is a species of flowering plant in the family Arecaceae, endemic to the Caroline Islands.

Usually growing to 20 metres (66 ft), but occasionally over 25 m (82 ft), these massive palms have solitary trunks with widely spaced leaf-scar rings and old leaf bases attached to the top.

The lanceolate leaflets are dark green to 1 m (3 ft 3 in) and occur on the rachis at varying angles, creating a plumose leaf.

Unlike its monocarpic relatives, this species has a narrow inflorescence which develops within the leaf-bases; the stem is erect until the fruit matures and then sags to a pendent cluster.

The single-seeded fruit are 9 centimetres (3.5 in) long, extremely hard, and are covered in brown, glossy scales.