 | Gerard Butler als Beowulf |
 | Spencer Wilding als Grendels Father |
 | Stellan Skarsgård als Hrothgar |
 | Ingvar E. Sigurðsson als Grendel |
 | Hringur Ingvarsson als Young Grendel |
 | Gunnar Eyjólfsson als Aeschere |
 | Tony Curran als Hondscioh |
 | Philip Whitchurch als Fisherman |
 | Ronan Vibert als Thorkel |
 | Rory McCann als Breca |
 | Martin Delaney als Thorfinn |
 | Ólafur Darri Ólafsson als Unferth |
 | Steinunn Ólína Þorsteinsdóttir als Wealtheow |
 | Sarah Polley als Selma |
 | Eddie Marsan als Father Brendan |
 | Gísli Örn Garðarsson als Erik |
| Sturla Gunnarsson | Director |
| Anonymous | Novel |
| Andrew Rai Berzins | Screenplay |
| Sturla Gunnarsson | Producer |
| Hilmar Örn Hilmarsson | Original Music Composer |
| Jan Kiesser | Director of Photography |
| Jeff Warren | Editor |
| Pam Dixon | Casting |
| Debra Hanson | Costume Design |
| Gary Hamilton | Producer |
| Eric Jordan | Producer |
| Anna María Karlsdóttir | Producer |
| Jason Piette | Producer |
| Paul Stephens | Producer |
| Árni Páll Jóhannsson | Production Design |
| Deirdre Bowen | Casting |
| Buffy Hall | Casting |
| Vicky Wildman | Casting |
| Sigrún Sól Ólafsdóttir | Casting |
| Robyn Rosenberg | Costume Supervisor |
| Michael Cowan | Producer |
| Martin Schlüter | Production Manager |
| Jane Tattersall | Supervising Sound Editor |
| Steph Carrier | Sound Re-Recording Mixer |
| Lou Solakofski | Sound Re-Recording Mixer |
| Jon Campfens | Visual Effects Supervisor |
| Aleksandar Yochkolovski | Visual Effects Supervisor |
| Peter Pedrero | Stunt Coordinator |
| Fridrik Orn | Still Photographer |
| Nick Wall | Still Photographer |
| Gary Deneault | Gaffer |
| Erik Hirt | Transportation Coordinator |
| Linda Gibson | Script Supervisor |
| Barry Gilmore | Dialogue Editor |
| Cynthia Amsden | Unit Publicist |
| Lesley Smith | Key Hair Stylist |
| Daniel Parker | Hair Designer |
| Lesley Smith | Key Makeup Artist |
| Daniel Parker | Makeup Designer |
| Nick Dudman | Makeup Effects Designer |
| Wendy Ord | First Assistant Director |
| Simon Morrissey | Property Master |
| Robert J. Lewis | Storyboard Artist |
| Thorfinnur Karlsson | Carpenter |
| Michael Flood | Rigging Gaffer |
| Chris Livingstone | Best Boy Grip |
| Simon De Glanville | Camera Trainee |
| Ingvar Stefánsson | Electrician |
| Dean Thompson | First Assistant Camera |
| Godi Már Gudbjörnsson | First Assistant Camera |
| Gordon Segrove | First Assistant Camera |
| Peter Davies | Generator Operator |
| Ásgrímur Guðbjartsson | Grip |
| Christian Drennan | Key Grip |
| Jason Coop | Second Assistant Camera |
| Jacob Barrie | Second Assistant Camera |
| Sheila Fitzpatrick | Assistant Costume Designer |
| Robyn Rosenberg | Costume Set Supervisor |
| Arthur Montreuil | Color Timer |
| Chris Wallace | Digital Intermediate Colorist |
| Dave Muscat | Digital Intermediate Editor |
| Nick Iannelli | Digital Intermediate Producer |
| Michelle Szemberg | First Assistant Editor |
| Catherine Rankin | Negative Cutter |
| Ivana Jeftic | Music Supervisor |
| Jon Einarsson Gustafsson | Epk Director |
| Garrett Kerr | ADR Editor |
| David Yonson | ADR Mixer |
| Ingvar Lundberg | ADR Recordist |
| Vanesa Lorena Tate | ADR Supervisor |
| Kathy Choi | Assistant Sound Editor |
| Simon Okin | Sound |
| William B. Kaplan | Sound Mixer |
| David McCallum | Supervising ADR Editor |
| David McCallum | Supervising Dialogue Editor |
| Safiya Gili | Digital Compositor |
| Gudrun Heinze | Digital Compositor |
| Susan R. Jones | Production Coordinator |
| David Rose | Sound Editor |
