A 12-year-old male pigeon (Columba livia) demonstrated anorexia, lethargy, emaciation, and loose droppings on clinical examination. The most striking finding was the distention of the abdominal region caused by the presence of a soft tissue mass, which was detected by palpation. Radiographs and surgery thereafter confirmed the presence of the solid tissue mass, which was diagnosed as a Sertoli cell tumor on histopathologic examination. Sertoli cell tumors are rare in birds, and this is the first known report of this tumor in a pigeon.