- Source: Tadayuki
- Tadayuki Okada
- Real: Love Murder Investigation Team
- Sirkuit Internasional Sentul
- Abe no Seimei
- Goblin Slayer
- Museum dan Galeri Seni Rudana
- Mizuno Tadakuni
- Domain Nagaoka
- Vanilla Air
- StarFlyer
- Tadayuki
- Tadayuki Okada
- Zipair Tokyo
- Tsunoda Tadayuki
- Mizuno Tadayuki
- Nishio Tadayuki
- Tadayuki Inoue
- Tadayuki Naitoh
- Makino Tadayuki
- Tadayuki Maruyama
Tadayuki (written: 忠恭, 忠之, 忠移, 忠進, 忠幸 or 忠行) is a masculine Japanese given name. Notable people with the name include:
Tadayuki Inoue (井上 忠行, 1935–2007), Japanese baseball player
Makino Tadayuki (牧野 忠恭, 1824–1878), Japanese daimyō of the late Edo period
Mizuno Tadayuki (水野 忠之, 1669–1731), Japanese daimyō of the Edo period
Nishio Tadayuki (西尾 忠移, 1746–1801), Japanese daimyō who ruled the Yokosuka Domain, and lived from the mid to late Edo period
Sakai Tadayuki (酒井 忠進, 1770–1828), Japanese daimyō of the mid to late Edo period, who ruled the Obama Domain
Tadayuki Kawahito (川人 忠幸, born 1947), Japanese photographer
Tadayuki Maruyama (丸山 忠行, born 1942), Japanese boxer
Tadayuki Naitoh (内藤 忠行, born 1941), Japanese photographer
Tadayuki Okada (born 1967), Japanese motorcycle racer
Tadayuki Takahashi (高橋 忠之, born 1956), Japanese figure skater and coach