- John Boyega as Melvin Dismukes,[9][10] a part-time security guard
- Will Poulter as Philip Krauss (based on David Senak), a Detroit police officer
- Algee Smith as Larry Reed, a member of The Dramatics
- Jacob Latimore as Fred Temple, The Dramatics' valet
- Jason Mitchell as Carl Cooper
- Hannah Murray as Julie Ann Hysell
- Kaitlyn Dever as Karen Malloy
- Jack Reynor as Demens (based on Ronald August), a Detroit police officer
- Ben O'Toole as Flynn (based on Robert Paille), a Detroit police officer
- Nathan Davis, Jr. as Aubrey Pollard
- Peyton Alex Smith as Lee Forsythe
- Malcolm David Kelley as Michael Clark
- Joseph David-Jones as Morris, a member of The Dramatics
- Laz Alonso as Congressman Conyers
- Ephraim Sykes as Jimmy, a member of The Dramatics
- Leon Thomas III as Darryl, a member of The Dramatics
- Gbenga Akinnagbe as Aubrey Pollard, Sr.
- Chris Chalk as Officer Frank, who leads the blind pig raid
- Jeremy Strong as Prosecuting Attorney Lang
- Austin Hébert as Warrant Officer Roberts of the Michigan Army National Guard
- Miguel Pimentel as Malcolm, Larry's replacement in The Dramatics
- Khris Davis as Blind Pig Patron
- John Krasinski as Defense Attorney Auerbach (based on Norman Lippitt)
- Anthony Mackie as Karl Greene (based on Robert Lee Greene)
- Mason Alban as Police Sergeant James, who is present at the blind pig raid
- Amari Cheatom as Undercover Cop at the blind pig
- Tyler James Williams as Leon, who is present at the blind pig raid and the start of the riot
- Dennis Staroselsky as Detective Jones
- Darren Goldstein as Detective Tanchuck
- Jonny P. as Announcer for the Swingin' Time Revue
- Samira Wiley as Vanessa, an employee at the Algiers Motel
- Devin Clark as Kid on Street helped by Dismukes
- Ricardo Pitts-Wiley as Spencer, Dismukes' coworker
- Bates Wilder as Michigan State Police Sergeant
- Kris Sidberry as Roberta Pollard, Aubrey's mother
- Lizan Mitchell as Ma Pollard, Aubrey's grandmother
- Chris Coy as Detective Thomas
- Glenn Fitzgerald as Homicide Detective Anderson
- Frank Wood as Judge Demascio
- Jennifer Ehle as Morgue Doctor (uncredited)
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