The grey-faced petrel (Pterodroma gouldi) is a petrel endemic to the North Island of New Zealand. In New Zealand it is also known by its Māori name ōi and (along with other species such as the sooty shearwater) as a muttonbird.
Grey-faced petrels are large birds, with a body length of 42–45 cm. They have a dark black-brown colouration, similar to that of the black-footed albatross, with a black bill and pale grey to buff feathers at the base of the bill and throat. The wings are long and enable a buoyant style of flight. Grey-faced petrels are easily confused with Great-winged petrel (Pterodroma macroptera) where their ranges overlap in the Tasman Sea, as these species are morphologically very similar.