Nick Robinson plays the lead role of Simon Spier, a high school student who is navigating his sexual identity while trying to keep it a secret.
Jennifer Garner portrays Emily Spier, Simon's mother who is supportive and loving but also struggling to connect with her son during his journey.
Josh Duhamel takes on the role of Jack Spier, Simon's father who tries to be understanding and supportive as his son goes through a challenging time.
Katherine Langford plays Leah Burke, Simon's close friend who is dealing with her own emotions while supporting Simon in his journey of self-discovery.
Alexandra Shipp portrays Abby Suso, one of Simon's friends who becomes an important part of his life as he navigates his identity.
Logan Miller plays Martin Addison, a classmate of Simon who inadvertently complicates Simon's life when he discovers his secret.
Keiynan Lonsdale takes on the role of Abraham 'Bram' Greenfeld, a student at Simon's school who shares a connection with Simon.
Jorge Lendeborg Jr. portrays Nick Eisner, one of Simon's classmates who is part of his close circle of friends.
Talitha Bateman plays Nora Spier, Simon's younger sister who provides some comic relief and sibling support during his struggles.
Tony Hale portrays Mr. Worth, the humorous and quirky vice principal at Simon's school who provides some comedic moments in the film.
Natasha Rothwell plays Ms. Albright, a supportive and understanding teacher at Simon's school who helps him navigate his feelings.
Miles Heizer portrays Cal Price, a classmate and friend of Simon who provides support and understanding during his journey of self-discovery.
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