Dustin Hoffman as Ted Kramer

Meryl Streep as Joanna Kramer

Jane Alexander as Margaret Phelps

Justin Henry as Billy Kramer

Howard Duff as John Shaunessy

George Coe as Jim O'Connor

JoBeth Williams as Phyllis Bernard

Bill Moor as Gressen

Howland Chamberlain as Judge Atkins

Jack Ramage as Spencer

Jess Osuna as Ackerman

Nicholas Hormann as Interviewer

Ellen Parker as Teacher

Shelby Brammer as Ted's Secretary

Carol Nadell as Mrs. Kline

Donald Gantry as Surgeon

Joe Seneca as Partygoer

David Golden as Grocer

Sean Albertson as Boy in Hospital (uncredited)

Iris Klein as Partygoer (as Iris Alhanti)