Ben Stiller as Roger Greenberg

Greta Gerwig as Florence Marr

Rhys Ifans as Ivan Schrank

Jennifer Jason Leigh as Beth (Beller's Party)

Mark Duplass as Eric Beller (Beller's Party)

Merritt Wever as Gina

Chris Messina as Phillip Greenberg

Brie Larson as Sara

Juno Temple as Muriel

Susan Traylor as Carol Greenberg

Mina Badie as Peggy

Zach Chassler as Marlon

Chris Coy as Guy at Gallery

Norizzela Monterroso as Female Vet

Jake Paltrow as Johno (Beller's Party)

Blair Tefkin as Megan (Beller's Party)

Dave Franco as Rich (Sara's Party)

Max Hoffman as Jerry (Sara's Party)

Ramona Gonzalez as Anita (Sara's Party)

Alessandra Ford Balazs as Olivia (Sara's Party)

Layla Delridge as Girl with Beer (Sara's Party)

Koby Rouviere as Greenberg Boy

Sydney Rouviere as Greenberg Girl

Emily Lacy as Gallery Band Member

Aaron Wrinkle as Gallery Band Member

Heather Lockie as Gallery Band Member

Charlotte Vida Silverman as Beller's Daughter (Beller's Party)

Nicole Luizzi as Vet Receptionist

Luke Clements as Guitarist

Alfredo Marin as Bus Boy

Jeremy Barber as Musso and Frank's Patron

Anna Culp as Musso and Frank's Patron

Erica Huggins as Musso and Frank's Patron

Dale J.E. Herbert II as Musso and Frank's Patron

Robert N. Wolfe as Male Vet

Trace Webb as Victor

Jessica Mills as Second Vet Receptionist

Maria Snow as Nurse

Nick Nordella as Kid at Stereo (Sara's Party)

Trent Gill as Kid at Stereo (Sara's Party)

Emily Kuntz as Guest (Sara's Party)

Zosia Mamet as Guest (Sara's Party)

Zoe Di Stefano as Guest (Sara's Party)

Cole M. Grief-Neil as Guest (Sara's Party)

Micah Schaffer as Guest (Sara's Party)

Sophie Savides as Musso and Frank's Patron

Megan Helbing as Guest - Sara's Party (uncredited)

Meghan Keeler as Drunk Party Guest (uncredited)

Meegan Michel as Party Guest (uncredited)

Danny Minnick as Musso and Frank's Patron (uncredited)

Desira Pesta as Coked Party Girl (uncredited)

Karen Strong as Party Girl (uncredited)

Sandra Valladares as Musso and Frank Patron (uncredited)

Carla Vila as Party Girl (uncredited)