The current study describes a case of endometrial polyps accompanied by an open-cervix pyometra in a15-year-old female Chinchilla Persian cat. The cat was presented with a history of a large mass in the endometriumand purulent discharge from the vulva. Ovariohysterectomy was performed and pedunculated polypoid mass on theendometrium was seen protruded into the uterine cavity. Histologically, the mass was composed of multiple cysticallydilated glands surrounded by fibrous stroma. Based on gross and histologic findings, the diagnosis for this case wasconcluded.