This is the first report of spontaneous nephroblastoma (embryonal nephroma), which was observed in a 25-day-old Broiler male chick in our region. Macroscopically tumor tissue located in the sublumbar region and occupied the whole lobes of the right kidney was grayish white, pinkish colored, encapsulated, at meat consistency, and a solitary mass. The cut surface was lobulated, myxomatous in structure, light brown colored and covered with foci of hemorrhage and necrosis. No metastases were observed in the lobes of the left kidney and extrarenal tissues. Microscopically, tumor tissue was composed of rather widespread mesenchymal and less spread epithelial components in varying degrees of differentiation.