Sakai Tadayuki (酒井忠進, April 4, 1770-March 12, 1828) was the 10th daimyō of Obama Domain in mid- to late Edo period Japan.^[1]

Tadayuki was the seventh son of Sakai Tadaka of Tsuruga Domain and was posthumously adopted as heir to Obama on the death of Sakai Tadatsura in 1806. His wife was a daughter of Okudaira Masashika of Nakatsu Domain. In 1808, he becamejisha-bugyō and from 1808 to 1815 served as the 37th Kyoto Shoshidai^[1] In 1815, he was ordered to oversee the reconstruction of the 5-story pagoda at Nikkō Tōshō-gū, which had been destroyed by a fire. Later that year, he was promoted to rōjū, holding that post until his death in 1828.