Yo Kagen (楊 嘉源 Japanese: Yō Kagen, Chinese: Yang Jiayuan, Pinyin: Yáng Jiāyuán, 29 April 1970) is a 9-dan professional Go player.
Yo was born in Taiwan. He moved to Japan in 1982 and married Chinen Kaori (Female Kisei 2000-03, -05) in 1997. His brother Yo Kaei is also a professional Go player.
The Nihon Ki-in gives his Chinese name as Yang Chia Yuan.