Saoirse Ronan

Lady Bird McPherson

Laurie Metcalf

Marion McPherson

Tracy Letts

Larry McPherson

Lucas Hedges

Danny O'Neill

Timothée Chalamet

Kyle Sheible

Beanie Feldstein

Julie Steffans

Lois Smith

Sister Sarah Joan

Stephen McKinley Henderson

Father Leviatch

Odeya Rush

Jenna Walton

Jordan Rodrigues

Miguel McPherson

Marielle Scott

Shelly Yuhan

John Karna

Greg Anrue

Jake McDorman

Mr. Bruno

Bayne Gibby

Casey Kelly

Laura Marano

Diana Greenway

Marietta DePrima

Miss Patty

Daniel Zovatto

Jonah Ruiz

Kristen Cloke

Ms. Steffans

Andy Buckley

Uncle Matthew

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

Richard Jin Namkung

Cool Coffee Manager

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

Georgia Leva

Senior Class Candidate

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

Ithamar Enriquez

Driving Instructor

Danielle Macdonald

Another Young Lady

Rebecca Light

Mr. Bruno's Wife

Janet Song

Administrator (uncredited)