- Leonardo DiCaprio as Frank Wheeler
- Kate Winslet as April Wheeler
- Michael Shannon as John Givings Jr.
- Kathryn Hahn as Milly Campbell
- David Harbour as Shep Campbell
- Kathy Bates as Helen Givings
- Dylan Baker as Jack Ordway
- Richard Easton as Howard Givings
- Zoe Kazan as Maureen Grube
- Jay O. Sanders as Bart Pollock
- Max Baker as Vince Lathrop
- Max Casella as Ed Small
- Ryan Simpkins as Jennifer Wheeler
- Ty Simpkins as Michael Wheeler
- John Behlmann as Mr. Brace
- Kristen Connolly as Mrs. Brace
- Catherine Curtin as Woman in Audience
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