Hidaka (written: 日高) is a Japanese surname. Notable people with the surname include:
Hatsuo Hidaka (born 1915), officer and ace fighter pilot in the Imperial Japanese Navy
Hidaka Sōnojō (1848–1932), admiral of the early modern Imperial Japanese Navy
Hiroaki Hidaka (1962–2006), Japanese serial killer
Ikuto Hidaka (born 1972), Japanese professional wrestler
Keita Hidaka (born 1990), Japanese footballer
Mayumi Hidaka (born 1981), Japanese actress
Mitsuhiro Hidaka (born 1986), Japanese singer, rapper, actor, and dancer
Noriko Hidaka (born 1962), Japanese voice actress
Noritaka Hidaka (born 1947), former Japanese football player
Rina Hidaka (born 1994), Japanese voice actress
Ryo Hidaka (born 1990), professional Japanese baseball player
Sumiko Hidaka (1923–2002), Japanese actress
Takeshi Hidaka (born 1977), Japanese professional baseball catcher
Takuma Hidaka (born 1983), Japanese footballer
Tomoki Hidaka (born 1980), Japanese football player
Usaburo Hidaka, former Japanese football player
Fictional characters:
Ken Hidaka, an anime character from Weiss Kreuz
Mamoru Hidaka, a character from Creamy Mami, the Magic Angel
Yuri Hidaka, a character from Hikaru no Go