William Billy Sherwood is an American musician, record producer, and engineer.

He is mostly known for his time as a member of progressive rock band Yes, first from 1997 to 2000, including for their albums Open Your Eyes (1997) and The Ladder (1999). He re-joined Yes in 2015, covering for (and eventually replacing) original bassist Chris Squire who was on hiatus from the band due to health issues shortly before his death on 27 June 2015.

Similarly, he joined Asia alongside Yes band mate Ge off Down es after the death of original singer and bassist John Wetton in 2017. He is also an accomplished solo artist, having released nine solo studio albums between 1999 and 2015.