Tadao (written: 忠雄, 忠夫, 忠男, 忠生, 忠郎 or 理男) is a masculine Japanese given name. Notable people with the name include:
, Japanese architect , Japanese daimyō , Japanese motorcycle engineer , Japanese banker , Japanese photographer , Japanese footballer and manager , Japanese screenwriter and film director , Japanese information theorist , Japanese inventor and engineer , Japanese shogi player , Japanese footballer and manager , Japanese photographer , Japanese anime director Tadao Nakamura (born 1947), Japanese golfer , Japanese mathematician , Japanese footballer , Japanese film critic and theorist , Japanese musician , Japanese astronomer and translator , Japanese footballer , Japanese mathematician , Japanese photographer Tadao Tomomatsu, American actor , Japanese diver , Japanese long-distance runner , Japanese gymnast , Japanese anthropologist , Japanese politician , Japanese economist and academic , Japanese sumo and professional wrestler
Fictional characters , a character in the manga series Lucky Star , a character in the manga series Ghost Sweeper Mikami