Ō Rissei (Chinese: 王立誠; pinyin: Wáng Lìchéng; born 7 November 1958) is a professional Go player in Japan.
Rissei was born in Taiwan and moved to Japan when he was 13 years old; he would become professional the following year. His instructor is Kano Yoshinori, while he is the instructor of his daughter O Keii, professional 2 dan.
Ranks #10-t in total number of titles in Japan.