Tadaaki (written: 忠秋, 忠明, 忠義, 忠朗, 忠顕 or 忠光) is a masculine Japanese given name. Notable people with the name include:
Abe Tadaaki (阿部 忠秋) (1602–1671), Japanese daimyō
Daijuyama Tadaaki (太寿山 忠明) (born 1959), Japanese sumo wrestler
Tadaaki Hirakawa (平川 忠亮) (born 1979), Japanese footballer
Ijuin Tadaaki (伊集院 忠朗) (1520–1561), Japanese samurai
Katō Tadaaki (加藤 忠明), Japanese samurai
Tadaaki Matsubara (松原 忠明) (born 1977), Japanese footballer
Matsudaira Tadaaki (松平 忠明) (1583–1644), Japanese samurai and daimyō
Tadaaki Miyake (三宅 忠明) (born 1939), Japanese writer
Mizuno Tadaaki (水野 忠光) (1771–1814), Japanese daimyō
Ōkubo Tadaaki (大久保 忠顕) (1760–1803), Japanese daimyō
Sakai Tadaaki (酒井 忠義) (1813 1873), Japanese daimyō
Tadaaki Otaka (尾高 忠明) (born 1947), Japanese conductor
