Nephroblastoma or embryonal nephroma is a renal tumor that is rarely seen in chickens older than 5 weeks. Avian leukosis viruses may cause nephroblastoma in the fowl. The carcass of a 2-year-old native fowl was referred for post-mortem examination. There was a large and cystic mass in the abdominal cavity. Based on the histopathological findings, the mass was diagnosed as nephroblastoma.