Jay Baruchel as Hiccup (voice)

America Ferrera as Astrid (voice)

F. Murray Abraham as Grimmel (voice)

Cate Blanchett as Valka (voice)

Gerard Butler as Stoick (voice)

Craig Ferguson as Gobber (voice)

Jonah Hill as Snotlout (voice)

Christopher Mintz-Plasse as Fishlegs (voice)

Kristen Wiig as Ruffnut (voice)

Kit Harington as Eret (voice)

Justin Rupple as Tuffnut (voice)

Robin Atkin Downes as Ack (voice)

Kieron Elliott as Hoark (voice)

Julia Emelin as Griselda the Grevious (voice)

Gideon Emery as Trapper (voice)

Ashley Jensen as Phlegma (voice)

AJ Kane as Young Hiccup (voice)

Ólafur Darri Ólafsson as Ragnar the Rock (voice)

James Sie as Chaghatai Khan (voice)

David Tennant as Spitelout / Ivar the Whitless (voice)