Rav Paltoi Yishia ben Rav Abaye Gaon HaKohen (Hebrew: רב פלטוי ישעיה בר אביי גאון הכהן: c. 820 – 858 ) was the Gaon of Pumbedita from 841 up until his death in 858. His time as Gaon would be defined by an idealistic and innovative tenure, which heralded a new era of prominence for the Gaonate of Pumbedita.