| Thomas Middleditch | Richard Hendricks |
| T.J. Miller | Erlich Bachman |
| Josh Brener | Nelson 'Big Head' Bighetti |
| Martin Starr | Bertram Gilfoyle |
| Kumail Nanjiani | Dinesh Chugtai |
| Amanda Crew | Monica Hall
(credit only) |
| Zach Woods | Donald 'Jared' Dunn |
| Matt Ross | Gavin Belson |
| Suzanne Cryer | Laurie Bream
(credit only) |
| Jimmy O. Yang | Jian Yang
(credit only) |
| Ben Feldman | Ron LaFlamme |
| Patrick Daniel | Tech Guy |
| Aly Mawji | Aly Dutta |
| Matt McCoy | Pete Monahan |
| Karen Strassman | Hooli Lead Counsel |
| Brian Tichnell | Jason |
| Cate Cohen | Melinda |
| Stephanie Rose Feldman | |
| Jules Hartley | Hooli Assistant Counsel |
| Bart McCarthy | Judge Underwood |
| Diallo Riddle | Paul |
| Toni French | Patron
(uncredited) |
| Alexander Michael Helisek | Claude
(uncredited) |