Tadamasa (written: 忠政, 忠正, 忠雅, 忠昌, 忠方, 忠誠 or 内政) is a masculine Japanese given name. Notable people with the name include:
, Japanese yakuza boss , Japanese art dealer , Japanese daimyō , Japanese nobleman , Japanese rower , Japanese politician , Japanese daimyō , Japanese daimyō , Japanese samurai , Japanese daimyō , Japanese daimyō , Japanese sprint canoeist , Japanese daimyō , Japanese daimyō , Japanese daimyō