Murphy's Petrel (Pterodroma ultima) is a species of seabird and a member of the gadfly petrels. The bird is 38-41 cm in size, with a 97 cm wingspan.

Very little is known about this species of Petrel. It occurs in the South Pacific, nesting on rocky islets and cliffs off tropical oceanic islands in the Austral, Tuamotu, and Pitcairn island groups. The bird has been recorded off the coast of the Hawaiian Islands and well off the Pacific Coast of the United States.