Nishio Tadanao (西尾 忠移, 1749 – May 9, 1801) was a daimyō in mid-Edo period Japan, who ruled Yokosuka Domain in Tōtōmi Province.Nishio Tadayuki was the second son of the third daimyō of Yokosuka Domain, Nishio Tadamitsu. As his elder brother Tadamasa died in October 1765, Tadayuki was chosen to succeed his father. In 1766 he received court rank and Yamashiro no Kami.