Willem Rogier van Otterloo (11 December 1941 – 29 January 1988) was a Dutch composer and conductor.

Van Otterloo was the eldest son of the conductor Willem van Otterloo, and was born in Bilthoven, Netherlands.

He composed several soundtracks for Dutch films and in 1980 became conductor of the Metropole Orkest for jazz music in Amsterdam.

He conducted five Dutch entries in Eurovision Song Contests: "Amsterdam" (1980), "Het is een wonder" (1981), "Jij en ik" (1982), "Ik hou van jou" (1984) and "Rechtop in de wind" (1987).

He died from mesothelioma in Bilthoven in 1988.