Dirofilaria repens, a natural parasite of dogs and cats in Europe, Asia, and Africa, sometimes infects man. In man the worms are usually in subcutaneous tissues or in the orbit. A case is herein reported in which a non-gravid, adult Dirofilaria, probably D. repens, was in the subcutaneous tissue of a resident of Wisconsin. The patient, however, acquired the infection 8 years previously in Greece.