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The carcass of a juvenile male goldcrest, Regulus regulus, was collected in November 14, 2016 at Kushiro, Hokkaido, Japan. Postmortem examination was performed and a louse-fly was obtained from its body surface. The findings suggested that the bird collided with a window and died by cerebral contusion and circulatory disorder due to pulmonary contusion. In addition, the fly was identified as Ornithomya fringillina based on morphological characters. To the best of our knowledge, this is the first record of O. fringillina from R. regulus in Kushiro region. [ABSTRACT FROM AUTHOR]