- Elliott Hanna
- Billy / Special Billy Finale
- Ollie Jochim
- Billy / Special Billy Finale
- Bradley Perret
- Billy / Special Billy Finale
- Matteo Zecca
- Billy / Special Billy Finale
- Ruthie Henshall
- Mrs. Wilkinson
- Deka Walmsley
- Dad
- Ann Emery
- Grandma
- Chris Grahamson
- Tony
- Howard Crossley
- George
- David Muscat
- Mr. Braithwaite
- Claudia Bradley
- Dead Mum
- Liam Mower
- Billy's Older Self (Live Broadcast)
- Barnaby Meredith
- Billy's Older Self (West End)
- David Bardsley
- Alternate Dad
- Gillian Elisa
- Alternate Grandma / Ensemble
- Craig Armstrong
- Ensemble
- Paul Basleigh
- Ensemble
- Spencer Cartwright
- Ensemble
- Lucinda Collins
- Ensemble
- Lee Hoy
- Ensemble
- Ruairidh Duguid
- Ensemble
- Charlie Martin
- Ensemble
- Alan Mehdizadeh
- Big Davey
- Steve Paget
- Ensemble
- Ben Redfern
- Ensemble
- Charlotte Riby
- Ensemble
- Mark John Richardson
- Ensemble
- Mike Scott
- Ensemble
- Phil Snowden
- Ensemble
- Wendy Somerville
- Ensemble
- Spencer Stafford
- Ensemble
- Zach Atkinson
- Michael
- David Stoller
- Ensemble / Scab / Posh Dad
- Todd Bell
- Michael
- Tomi Fry
- Michael
- Kyria Cooper
- Debbie
- Danya Dixon
- Debbie
- Demi Lee
- Debbie
- Niamh Bennett
- Ballet Girls (Live Broadcast)
- Ella Forman
- Ballet Girls (Live Broadcast)
- Imogen Gurney
- Ballet Girls (Live Broadcast)
- Lauren Henson
- Ballet Girls (Live Broadcast)
- Imogen Kingsley Smith
- Ballet Girls (Live Broadcast)
- Erin McIver
- Ballet Girls (Live Broadcast)
- Syakira Moeladi
- Ballet Girls (Live Broadcast)
- Natasha Pye
- Ballet Girls (Live Broadcast)
- Charlotte Ross-Gower
- Ballet Girls (Live Broadcast)
- Sophie Smart
- Ballet Girls (Live Broadcast)
- Carla Arnold
- Ballet Girls (West End)
- Niamh Ashley
- Ballet Girls (West End)
- Elise Bugeja
- Ballet Girls (West End)
- Katie-Mae Collins
- Ballet Girls (West End)
- Holly-Marie Davenport
- Ballet Girls (West End)
- Macy Dawson
- Ballet Girls (West End)
- Zara Redmond Gilhooly
- Ballet Girls (West End)
- Sophie Green
- Ballet Girls (West End)
- Esa Halil
- Ballet Girls (West End)
- Lydia Kalian
- Ballet Girls (West End)
- Brooke Kelly
- Ballet Girls (West End)
- Allanah Martin Judge
- Ballet Girls (West End)
- Emily-Alice Miles
- Ballet Girls (West End)
- Ellie Munden
- Ballet Girls (West End)
- Laveda Ogbebor
- Ballet Girls (West End)
- Georgia Prentice
- Ballet Girls (West End)
- Katie Smith
- Ballet Girls (West End)
- Jessica Smith
- Ballet Girls (West End)
- Liam Sargeant
- Small Boy (Live Broadcast)
- Milan Strachan
- Ballet Girls (West End)
- Maisy-May Woods-Smeeth
- Ballet Girls (West End)
- Lewis Fernee
- Small Boy (West End)
- Joseph McDonald
- Small Boy (West End)
- Caspar Meurisse
- Tall Boy (Live Broadcast)
- Billy Marlow
- Small Boy (West End)
- Romy Baskerville
- Voices
- Ryan May-Miller
- Tall Boy (West End)
- Helen French
- Voices
- Frederick Neilson
- Tall Boy (West End)
- Mitchell Moreno
- Voices
- Millie Thornton
- Voices
- Russell Wilcox
- Voices
- George Maguire
- Special Billy Finale
- James Lomas
- Special Billy Finale
- Leon Cooke
- Special Billy Finale
- Matthew Koon
- Special Billy Finale
- Layton Williams
- Special Billy Finale
- Josh Fedrick
- Special Billy Finale
- Fox Jackson-Keen
- Special Billy Finale
- Ollie Gardner
- Special Billy Finale
- Rhys Yeomans
- Special Billy Finale
- Aaron Watson
- Special Billy Finale
- Scott Mckenzie
- Special Billy Finale
- Josh Baker
- Special Billy Finale
- Ryan Dean
- Special Billy Finale
- Kaine Ward
- Special Billy Finale
- Harris Beattie
- Special Billy Finale
- Harrison Dowzell
- Special Billy Finale
- Redmand Rance
- Special Billy Finale
- Ali Rasul
- Special Billy Finale
- Chris Jenkins
- Ensemble
- Karissa-Rose-Goodwin
- Ensemble
- Mia McKenna-Bruce
- Ballet Girls (West End)
- Tom Holland
- Former Billy (Encore)
