Oenopota harpa is a species of sea snail, a marine gastropod mollusk in the family Mangeliidae.

(Original description) The moderately thin shell has a fusiform shape.

These a re crossed by numerous close-set spiral threads, separated by narrow grooves, both faint near the suture.

The shell is whitish, with a reddish tinge anteriorly, especially on the body whorl.

[2] This marine species occurs off Arctic Russia, in the Sea of Okhotsk and off Alaska and south to Queen Charlotte Sound, British Columbia.