Taira no Shigemori (平重盛, 1138 – September 2, 1179) was the eldest regent of the Taira clan patriarch, Taira no Kiyomori. He supported his father in the Heiji Rebellion. He died two years before his father. His son, Taira no Koremori, became a monk in 1184 during Genpei War period, and drowned himself. Oda Nobunaga claimed to have descended from him through his grandson, Taira no Chikazane.