Tadayoshi (written: 忠義, 忠吉, 忠良, 忠善, 忠美, 忠由 or 直義) is a masculine Japanese given name. Notable people with the name include:
Ashikaga Tadayoshi (足利 直義) (1306–1352), Japanese samurai
Ichijō Tadayoshi (一条 忠良) (1774–1837), Japanese kugyō
Tadayoshi Ichida (市田 忠義) (born 1942), Japanese politician
Tadayoshi Nagashima (長島 忠美) (born 1951), Japanese politician
Nishio Tadayoshi (西尾 忠善) (1768–1831), Japanese daimyō
Ōkubo Tadayoshi (I) (大久保 忠由) (1736–1769), Japanese daimyō
Ōkubo Tadayoshi (II) (大久保 忠良) (1857–1877), Japanese daimyō
Tadayoshi Okura (大倉 忠義) (born 1985), Japanese idol, singer and actor
Tadayoshi Sano (佐野 忠義) (1889–1945), Japanese general
Satomi Tadayoshi (里見 忠義) (1594–1622), Japanese samurai and daimyō
Shimazu Tadayoshi (島津 忠良) (1493–1568), Japanese daimyō
Shimazu Tadayoshi (2nd) (島津 忠義) (1840–1897), Japanese daimyō
Torii Tadayoshi (鳥居 忠吉) (died 1571), Japanese samurai
Tadayoshi Yokota (横田 忠義) (born 1947), Japanese volleyball player
