Aranaz is a Spanish surname. Notable people with the surname include:
(born 1995), Spanish Female International Master of chess (1891–1958), Spanish military officer (1917–2010), Spanish antiquarian and cultural promoter Luis Aranaz (1914–1981), Spanish footballer and manager (1875–1925), Spanish writer born in Cuba (1910–1939), Spanish athlete and pioneer of Galician sport (1885–1944), Cuban actor, pianist, and comedy director Pedro Aranaz (1742–1821), Spanish composer (1883–1940), Spanish professor and essayist (1852–1932), Spanish military officer and physicist
See also Arantza, a town and municipality in Navarre, which is known as Aranaz in Spanish