Over seventy musicians have performed live as a Waterboy.
Some have spent only a short time with the band, contributing to a single tour or album, while others have been long-term members with significant contributions.
Scott has been the band's lead vocalist, motivating force, and principal songwriter throughout the group's history, but a number of other musicians are closely identified with the band.

Anthony Thistlethwaite was an original member of the band, and remained a member until 1991 when the band broke up, although he also joined a few recording sessions for A Rock in the Weary Land.
After Scott and Wickham, Thistlethwaite has more songwriting credits than any other Waterboy.
His saxophone, regularly featured in solos, was one half of the early group's distinctive brass section, but he has also played guitar, keyboards and a number of other instruments for the band.
He pressed to return The Waterboys to a rock music sound after Room to Roam, but did not appear on Dream Harder, the result of that decision.
He is now a member of The Saw Doctors, and has also released three solo albums.

Original member Kevin Wilkinson was the band's drummer from 1983–1984, and continued to play in some studio sessions afterwards.
His later appeared on A Rock in the Weary Land.
He led the rhythm section of the group during its "Big Music" phase, sometimes without the assistance of any bass guitar.
Scott describes Wilkinson's drumming as "bright and angular, an unusual sound".

Karl Wallinger joined the group in 1983, shortly after its formation.
He left the group two years later, but in that relatively short period made important contributions to both A Pagan Place and This Is the Sea.
He co-wrote "Don't Bang the Drum", the environmentalism anthem on the latter album.
His keyboards and synthesiser work expanded the group's sound, and he also did some studio work for demo sessions.
Wallinger's World Party project was heavily influenced by his work with The Waterboys.

Roddy Lorimer's participation began in 1983, contributing his trumpet playing "on and off" until 1990.
He and Thistlethwaite took turns leading the brass section of the band, and Lorimer was also a featured soloist, most famously on "The Whole of the Moon" and "Don't Bang the Drum".
He further contributed backing vocals to the song.
His trumpet style is a combination of his classical training with an experimental approach encouraged by Scott.
Lorimer returned for some studio work in 2006.

Steve Wickham transformed the group when he joined in 1985; his interest in folk music directly resulted in the band's change of direction.
His initial involvement with The Waterboys ended in 1990 when Scott and Thistlethwaite wanted to return to rock and roll, but Wickham rejoined the group again in 2000, and, as of 2007, continues to perform with the band.
Described by Scott as "the world's greatest rock fiddle player", he has written more songs for the band than anyone other than Scott, including the group's handful of instrumental recordings.

Richard Naiff first recorded with the band in 1999, and joined permanently in 2000.
As of 2007, he was a core member, along with Scott and Wickham.
He is a classically trained pianist and flautist, and plays keyboards for The Waterboys.
Ian McNabb described him as Scott's "find of the century" and reviewers have described him as "phenomenally talented".
Naiff officially left The Waterboys in February 2009 to spend more time with his family.

Other notable past members have included Ian McNabb, leader of Icicle Works; Sharon Shannon, who became Ireland's all-time best-selling traditional musician; the experimental musician Thighpaulsandra, producer Guy Chambers, Patti Smith drummers Jay Dee Daugherty and Carlos Hercules, bassists Steve Walters and Mark Smith who was the band's bassist when he died on 3 November 2009.

The Waterboys line-up as of 2010 appeared at the world premiere of An Appointment With Mr Yeats at The Abbey Theatre, Dublin.
They expanded into a 9-piece band in the autumn of 2017 for their tour of the UK, Ireland and Europe.

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Over seventy musicians have performed live as a Waterboy. Some have spent only a short time with the band, contributing to a single tour or album, while others have been long-term members with significant contributions. Scott has been the band's lead vocalist, motivating force, and principal songwriter throughout the group's history, but a number of other musicians are closely identified with the band.
Anthony Thistlethwaite was an original member of the band, and remained a member until 1991 when the band broke up, although he also joined a few recording sessions for A Rock in the Weary Land. After Scott and Wickham, Thistlethwaite has more songwriting credits than any other Waterboy. His saxophone, regularly featured in solos, was one half of the early group's distinctive brass section, but he has also played guitar, keyboards and a number of other instruments for the band. He pressed to return The Waterboys to a rock music sound after Room to Roam, but did not appear on Dream Harder, the result of that decision. He is now a member of The Saw Doctors, and has also released three solo albums.
Original member Kevin Wilkinson was the band's drummer from 1983–1984, and continued to play in some studio sessions afterwards. His later appeared on A Rock in the Weary Land. He led the rhythm section of the group during its "Big Music" phase, sometimes without the assistance of any bass guitar. Scott describes Wilkinson's drumming as "bright and angular, an unusual sound".
Karl Wallinger joined the group in 1983, shortly after its formation. He left the group two years later, but in that relatively short period made important contributions to both A Pagan Place and This Is the Sea. He co-wrote "Don't Bang the Drum", the environmentalism anthem on the latter album. His keyboards and synthesiser work expanded the group's sound, and he also did some studio work for demo sessions. Wallinger's World Party project was heavily influenced by his work with The Waterboys.
Roddy Lorimer's participation began in 1983, contributing his trumpet playing "on and off" until 1990. He and Thistlethwaite took turns leading the brass section of the band, and Lorimer was also a featured soloist, most famously on "The Whole of the Moon" and "Don't Bang the Drum". He further contributed backing vocals to the song. His trumpet style is a combination of his classical training with an experimental approach encouraged by Scott. Lorimer returned for some studio work in 2006.
Steve Wickham transformed the group when he joined in 1985; his interest in folk music directly resulted in the band's change of direction. His initial involvement with The Waterboys ended in 1990 when Scott and Thistlethwaite wanted to return to rock and roll, but Wickham rejoined the group again in 2000, and, as of 2007, continues to perform with the band. Described by Scott as "the world's greatest rock fiddle player", he has written more songs for the band than anyone other than Scott, including the group's handful of instrumental recordings.
Richard Naiff first recorded with the band in 1999, and joined permanently in 2000. As of 2007, he was a core member, along with Scott and Wickham. He is a classically trained pianist and flautist, and plays keyboards for The Waterboys. Ian McNabb described him as Scott's "find of the century" and reviewers have described him as "phenomenally talented". Naiff officially left The Waterboys in February 2009 to spend more time with his family.
Other notable past members have included Ian McNabb, leader of Icicle Works; Sharon Shannon, who became Ireland's all-time best-selling traditional musician; the experimental musician Thighpaulsandra, producer Guy Chambers, Patti Smith drummers Jay Dee Daugherty and Carlos Hercules, bassists Steve Walters and Mark Smith who was the band's bassist when he died on 3 November 2009.
The Waterboys line-up as of 2010 appeared at the world premiere of An Appointment With Mr Yeats at The Abbey Theatre, Dublin. They expanded into a 9-piece band in the autumn of 2017 for their tour of the UK, Ireland and Europe.
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The Waterboys