Acanthodoris pina is a species of sea slug, a dorid nudibranch, a shell-less marine gastropod mollusc in the family Onchidorididae.

[4][5] This species was described from Puerto Penasco, Sonora, Mexico.

It has been reported from there south to Bahía de los Ángeles.

[6] It is thought to be endemic to the northern part of the Gulf of California.

[2] Specimens from Baja California have been sequenced for the 16S ribosomal RNA, Histone H3 and CO1 genes.