Jim Carrey
Joel Barish
Kate Winslet
Clementine Kruczynski
Kirsten Dunst
Mary
Mark Ruffalo
Stan
Elijah Wood
Patrick
Tom Wilkinson
Dr. Mierzwiak
Jane Adams
Carrie
David Cross
Rob
Deirdre O'Connell
Hollis
Thomas Jay Ryan
Frank
R
Ryan Whitney
Young Joel
Lola Daehler
Young Clementine
Debbon Ayer
Joel's Mother
G
Gerry Robert Byrne
Train Conductor
B
Brian Price
Young Bully
Josh Flitter
Young Bully
Paulie Litt
Young Bully
Amir Ali Said
Young Bully
Lauren Adler
Rollerblader (uncredited)