Ben Affleck Batman / Bruce Wayne Henry Cavill Superman / Clark Kent / Kal-El Amy Adams Lois Lane Gal Gadot Wonder Woman / Diana Prince Ezra Miller The Flash / Barry Allen Jason Momoa Aquaman / Arthur Curry Ray Fisher Cyborg / Victor Stone Jeremy Irons Alfred Pennyworth Diane Lane Martha Kent Connie Nielsen Queen Hippolyta J.K. Simmons Commissioner James Gordon Ciarán Hinds Steppenwolf (voice) Amber Heard Mera Joe Morton Silas Stone Lisa Loven Kongsli Menalippe Ingvar E. Sigurðsson Mayor David Thewlis Ares Sergi Constance Zeus Julian Lewis Jones Ancient Atlantean King Salome R. Gunnarsdottir Singing Icelandic Woman Ágústa Eva Erlendsdóttir Young Icelandic Woman Michael McElhatton Black Clad Alpha John Dagleish Black Clad Beta Chris Courtenay Old Bailey Judge Lara Decaro School Girl Will Austin MP Guard Holt McCallany Burglar (uncredited) Billy Crudup Henry Allen (uncredited) Joe Manganiello Slade Wilson / Deathstroke (uncredited) Robin Wright Antiope (uncredited)