- Joaquin Phoenix as Freddie Quell
- Philip Seymour Hoffman as Lancaster Dodd
- Amy Adams as Peggy Dodd
- Laura Dern as Helen Sullivan
- Ambyr Childers as Elizabeth Dodd
- Rami Malek as Clark Massey
- Jesse Plemons as Val Dodd
- Kevin J. O'Connor as Bill William
- Christopher Evan Welch as John More
- Madisen Beaty as Doris Solstad
- Lena Endre as Mrs. Solstad
- Amy Ferguson as Martha, the salesgirl
- Patty McCormack as Mildred Drummond
- Jillian Bell as Susan Gregory
- Joshua Close as Wayne Gregory
- Fiona Dourif as Dancer[5]
- David Warshofsky as Philadelphia police[6]
- Steven Wiig as Philadelphia follower
- W. Earl Brown as Fighting businessman
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