In his account of the biology of the Black-vented Shearwater (Puffinus opisthomelas), Everett (1988) mentioned that “leucism and partial albinism . . . are so far unrecorded for opisthomelas.” Such plumage aberrations are widely recorded among birds, including, among procellariids, Sooty Shearwaters (P. griseus; Palmer 1962, Stallcup 1976) and a Greater Shearwater (P. gravis) off New England (Vickery 1978). Within the Puffinus puffinus complex, leucism has been documented for P. p. mauretanicus (Mackrill and Yesou 1988, Elkins 1990) and P. p. puffinus (Flumm 1990). This note presents photographic documentation of two leucistic Black-vented Shearwaters and briefly discusses implications for field identification of shearwaters. Leucism is used here in the sense of Buckley (1982) to signify a reduction or local absence of pigment short of albinism (the complete lack of pigment).