Riu or RIU may refer to:
People Riu (surname), a Korean surname Giovanni de Riu (1925–2008), Italian racing driver Ramon Riu i Cabanes (1852–1901), Bishop of Urgell and ex officio Co-Prince of Andorra Victor Riu (born 1985), French golfer
Other uses Rancho Murieta Airport, in California, United States Riau Airlines, defunct Indonesian airline Riu de Cerdanya, in Catalonia, Spain RIU Hotels, a Spanish hotel chain Rio (disambiguation) Ríos (disambiguation)