Tadayuki is a masculine Japanese given name. Notable people with the name include:
Makino Tadayuki (1824–1878), Japanese daimyo of the late Edo period
Mizuno Tadayuki (1669–1731), Japanese daimyo of the Edo period
Nishio Tadayuki (1746–1801), Japanese daimyo who ruled the Yokosuka Domain, and lived from the mid to late Edo period
Sakai Tadayuki (1770–1828), Japanese daimyo of the mid to late Edo period, who ruled the Obama Domain
Tadayuki Kawahito (born 1947), renowned Japanese photographer
Tadayuki Naitoh (born 1941), Japanese photographer known for his photographs of jazz musicians and of Africa
Tadayuki Okada (born 1967), Japanese professional Grand Prix motorcycle road racer
Tadayuki Takahashi (born 1956), Japanese figure skater who is now a coach
