Saoirse Ronan
Christine "Lady Bird" McPherson
Laurie Metcalf
Marion McPherson
Tracy Letts
Larry McPherson
Beanie Feldstein
Julie Steffans
Lucas Hedges
Danny O'Neill
Timothée Chalamet
Kyle Sheible
Stephen McKinley Henderson
Father Leviatch
Jordan Rodrigues
Miguel McPherson
Marielle Scott
Shelly Yuhan
Lois Smith
Sister Sarah Joan
Odeya Rush
Jenna Walton
Jake McDorman
Mr. Bruno
John Karna
Greg Anrue
Bayne Gibby
Casey Kelly
Laura Marano
Diana Greenway
Marietta DePrima
Miss Patty
Daniel Zovatto
Jonah Ruiz
Kristen Cloke
Ms. Steffans
Andy Buckley
Matt
Paul Keller
Parish Priest
Kathryn Newton
Darlene Bell
Myra Turley
Sister Gina
Bob Stephenson
Father Walter
Abhimanyu Katyal
Friendly Banker
Chris Witaske
Business Jock
Ben Konigsberg
David From College
Gurpreet Gill
Convenience Store Clerk
Richard Jin Namkung
Cool Coffee Manager
Joan Patricia O'Neil
Danny's Grandmother
Robert Figueroa
Cast Removal Doctor
Carla Valentine
Guidance Counselor
Roman Arabia
Luis Cruz
Monique Edwards
NYC Nurse
Matthew Maher
NYC Man on Street
Anita Kalathara
Prom Chairwoman
Debra Miller
Saleswoman Joyce
Georgia Leva
Senior Class Candidate
Derek Butler
"Merrily We Roll Along" Performer
London Thor
"Merrily We Roll Along" Performer
Shaelan O'Connor
"Merrily We Roll Along" Performer
Christina Offley
"Merrily We Roll Along" Performer
Sabrina Schloss
"Merrily We Roll Along" Performer
Connor Mickiewicz
"Merrily We Roll Along" Performer
Erik Daniells
"Merrily We Roll Along" Performer
Cynthia Cales
Immaculate Heart of Mary Teacher
Giselle Grams
Immaculate Heart of Mary Teacher
Ithamar Enriquez
Driving Instructor
Luisa Lee
Young Lady
Danielle Macdonald
Another Young Lady
Adam Brock
Band Lead Singer
Bonnie Jean Shelton
Fab 40s Realtor
Rebecca Light
Mr. Bruno's Wife
Janet Song
Administrator (uncredited)