Yūki (written: 結城 or 夕樹) is a Japanese surname. Notable people with the surname include:
Aira Yuhki (born 1981), Japanese singerAsuka Yūki, Japanese AV idolSatoshi Yuki (born 1972), Japanese professional Go playerHiro Yūki (born 1965), Japanese voice actorMaiko Yūki (born 1977), Japanese AV idol, actress and stripperMasahiko Yuki (born 1975), Japanese guitaristNobuteru Yūki (born 1962), Japanese manga artist, illustrator, and animatorYuki Hide a.k.a. Hideyuki Hirano (1940–1998), Japanese singerYūki Hideyasu (1574–1607), Japanese daimyo who lived during the Azuchi-Momoyama and early Edo periodsYūki Masakatsu (1503–1559), Japanese samurai during the Sengoku period