Bill Carroll (born December 29, 1966, in Wilmington, Delaware) is an American singer, songwriter, record producer, bassist and guitarist.

As solo artist, he scored a Rate-A-Record appearance on Dick Clark's American Bandstand program on April 2, 1988, with "When We're Apart", shortly after being signed to Hollywood-based Aardvark Records.

[1] Carroll's musical styles have ranged from serious orchestral arrangements (Dune I from 1994's Kohoutek) to television, sitcom, and film scores, with themes like The Mecklenburgers, to what he is best known for: rock and roll power pop.

He is heavily influenced by The Beatles, The Who, The Jam, REM, Jellyfish, and less mainstream artists such as Bruce Foxton, Lee Mavers, Kevin Gilbert and John Wetton.

He remained with the group until it disbanded in 2001, but as of 2009, Doubting Thomas had reformed for limited performances, and began recording a new album in 2023.