The Lanceolated Warbler (Locustella lanceolata) is a Eurasian species whose breeding range reaches east to include northern Japan, the Kuril Islands, and the Kamchatka Peninsula. It has been recorded three times previously in North America—twice in the western Aleutian Islands, Alaska, once in California. During our work at Buldir Island, western Aleutian Islands, in 2007, we documented the fourth occurrence of the species and the first nesting record within the political limits of North America.