Vo filme Dredd hrajú Karl Urban (Judge Dredd), Olivia Thirlby (Cassandra Anderson), Lena Headeyová (Ma-Ma), Wood Harris (Kay), Langley Kirkwood (Judge Lex), Tamer Burjaq (Ma-Ma Bodyguard), Joe Vaz (Big Joe), Rakie Ayola (Chief Judge), Junior Singo (Amos), Luke Tyler (Freel), Jason Cope (Zwirner), Domhnall Gleeson (Clan Techie), Warrick Grier (Caleb (uncredited)), Rachel Wood (Control Operator 1), Andile Mngadi (Passenger (uncredited)), Porteus Xandau (Driver (uncredited)), Emma Breschi (Hostage (uncredited)), Shoki Mokgapa (Woman with Child (uncredited)), Yohan Chun (Girl in Window (uncredited)), Eden Knowles (Girl in Window (uncredited)), Desmond Lai Lan (Homeless Man (uncredited)), Deobia Oparei (Paramedic TJ (uncredited)), Patrick Lyster (Control Operator 2 (uncredited)), Travis Snyders (Slo-Mo Junkies (uncredited)), Scott Sparrow (Japhet (uncredited)), Marty Kintu (Big Joe Gang Member (uncredited)), Nicole Bailey (Cathy (uncredited)), Daniel Hadebe (Judge at Entrance (uncredited)), Francis Chouler (Judge at Entrance (uncredited)), Edwin Perry (Judge Alwarez (uncredited)), Karl Thaning (Judge Chan (uncredited)), Michele Levin (Judge Kaplan (uncredited)), Chad Phillips (Slo-Mo Junkie).