The wedge-tailed shearwater (Ardenna pacificus) is a medium-large shearwater in the seabird family Procellariidae. It is one of the shearwater species that is sometimes referred to as a muttonbird, like the sooty shearwater of New Zealand and the short-tailed shearwater of Australia. It ranges across from throughout the tropical Pacific and Indian Ocean roughly between latitudes 35°N and 35°S. It breeds on islands off of Japan, on the Islas Revillagigedo, the Hawaiian Islands, the Seychelles and off Eastern and Western Australia.