Gen'ō (元応) was a Japanese era name (年号,nengō, "year name") after Bunpō and before Genkō. This period spanned the years from April 1319 through February 1321. The reigning Emperor was Go-Daigo-tennō (後醍醐天皇).
1319 (Gen'ō 1, in the 8th month): The emperor took Kishi, the daughter of Saionji Sanekane, as one of his concubines; and she became a favorite. In addition, he had many concubines, which meant that he had many sons and daughters.
1330 (Gen'ō 2, 5th month): Hōjō Tokiasu, the kanrei in Kyoto, died at Rokuhara mansion, which was the stronghold of the Kamakura shogunate in the capital. Tokiasu's shogunate position was also known as Rokuhara Tandai and Kitakata.