William Morris Nicholls Jr (born 15 February 1949) is an English singer, songwriter, composer, record producer, and musical director.

Nicholls wrote several of the tracks for the film McVicar (starring Roger Daltrey) including "Without Your Love", which was a success in the United States.

An American southern rock group, the Outlaws, recorded "I Can't Stop Loving You" on their 1980 release Ghost Riders.

A longtime acquaintance and occasional collaborator with Pete Townshend, Nicholls was involved in the Deep End concerts in Brixton and Cannes.

He toured with The Who in 1989 and 1996–1997, serving as backup singer and music director; he also provided backing vocals for the band's version of "Saturday Night's Alright for Fighting", which appeared on the tribute album Two Rooms: Celebrating the Songs of Elton John & Bernie Taupin.