| Rami Malek | Elliot Alderson |
| Carly Chaikin | Darlene |
| Michael Cristofer | Phillip Price |
| Grace Gummer | Dominique DiPierro |
| BD Wong | Whiterose |
| Ashlie Atkinson | Janice |
| Christian Slater | Mr. Robot |
| Evan Whitten | Young Elliot |
| Vaishnavi Sharma | Elliot's Mother |
| Jing Xu | Wang Shu |
| Alex Morf | Deegan McGuire |
| Garth Kravits | Agent Horton
(as Garth Kravitz) |
| Jeff Blumenkrantz | Bank Manager |
| Daniel Morgan Shelley | Special Agent Kaz |
| Stacey Raymond | FBI Agent Hartman |
| Ben Odom | Snowman |
| Bonnie Rose | Nurse |
| Angela Pietropinto | Customer |
| Pope Benedict XVI | Self
(archive footage) (uncredited) |
| Fidel Castro | Self
(archive footage) (uncredited) |
| Dick Cheney | Self
(archive footage) (uncredited) |
| Jim Cleary | Pedestrian
(uncredited) |
| Eric Doss | Funeral Director
(uncredited) |
| Frank Fernandez | Pedestrian
(uncredited) |
| Al Gore | Self
(archive footage) (uncredited) |
| Ken Holmes | Pedestrian /
Train Passenger
(uncredited) |
| Ayatollah Ali Khamenei | Self
(archive footage) (uncredited) |
| Mark Lehneman | High End Hotel Guest
(uncredited) |
| Doris McCarthy | Hotel Guest
(uncredited) |
| Barack Obama | Self
(archive footage) (uncredited) |
| Vladimir Putin | Self
(archive footage) (uncredited) |
| Queen Elizabeth II | Self
(archive footage) (uncredited) |
| Bernard Shaw | Self
(archive sound) (uncredited) |