 | Jay Baruchel als Hiccup (voice) |
 | America Ferrera als Astrid (voice) |
 | F. Murray Abraham als Grimmel (voice) |
 | Cate Blanchett als Valka (voice) |
 | Gerard Butler als Stoick (voice) |
 | Craig Ferguson als Gobber (voice) |
 | Jonah Hill als Snotlout (voice) |
 | Christopher Mintz-Plasse als Fishlegs (voice) |
 | Kristen Wiig als Ruffnut (voice) |
 | Kit Harington als Eret (voice) |
 | Justin Rupple als Tuffnut (voice) |
 | Robin Atkin Downes als Ack (voice) |
 | Kieron Elliott als Hoark (voice) |
 | Julia Emelin als Griselda the Grevious (voice) |
 | Gideon Emery als Trapper (voice) |
 | Ashley Jensen als Phlegma (voice) |
 | AJ Kane als Young Hiccup (voice) |
 | Ólafur Darri Ólafsson als Ragnar the Rock (voice) |
 | James Sie als Chaghatai Khan (voice) |
 | David Tennant als Spitelout / Ivar the Whitless (voice) |
| Dean DeBlois | Director |
| Dean DeBlois | Screenplay |
| Simon Otto | Animation |
| Dean DeBlois | Story |
| Colleen O'Hagan | Visual Effects |
| Chris Hewitt | Post Production Assistant |
| Tucker Scott Alleborn | Production Coordinator |
| Willem Drees | Visual Effects |
| Christina N. de Juan | Visual Effects |
| Hongseo Park | Visual Effects |
| Doug Davison | Co-Producer |
| John Powers Middleton | Executive Producer |
| Dave Walvoord | Visual Effects Supervisor |
| Roy Lee | Co-Producer |
| Tighe Sheldon | Sound |
| Megha Davalath | Animation |
| Leo Sanchez Barbosa | Animation |
| Michael A. Connolly | Co-Producer |
| Dean DeBlois | Executive Producer |
| Brent Hutchins | Production Manager |
| Bonnie Arnold | Producer |
| Jennifer J. Pan | Supervising Technical Director |
| John K. Carr | Editor |
| Pierre-Olivier Vincent | Production Design |
| Gil Zimmerman | Director of Photography |
| Tyler Shelton | Production Supervisor |
| Kate Spencer | Co-Producer |
| Jessica Bayliss | Production Supervisor |
| Chris Sanders | Executive Producer |
| Henri Hovhanesyan | Production Supervisor |
| Brent Hutchins | Production Supervisor |
| Jed Schlanger | Co-Producer |
| Allison Bernardi Stauth | Production Supervisor |
| Peter Litvack | Production Supervisor |
| Mary Melendez | Production Supervisor |
| Chris Palmer | Story Artist |
| Lisa Curtis Saunders | Pipeline Technical Director |
| Brit DeLillo | Assistant Editor |
| Carter Goodrich | Character Designer |
| Nelson Yokota | Storyboard Artist |
| John Powell | Original Music Composer |
| Andrew Harkins | Animation |
| Natalia Cronembold | Associate Editor |
| Stephanie Ma Stine | Storyboard Artist |
| Cressida Cowell | Book |
| Brad Lewis | Producer |
| Randy Thom | Sound Designer |
| Randy Thom | Supervising Sound Editor |
| Brian Chumney | Supervising Sound Editor |
| Gary Rizzo | Sound Re-Recording Mixer |
| Scott R. Lewis | Sound Re-Recording Mixer |
