Chris Hemsworth as Thor

Natalie Portman as Jane Foster

Tom Hiddleston as Loki

Christopher Eccleston as Malekith

Anthony Hopkins as Odin

Jaimie Alexander as Sif

Zachary Levi as Fandral

Ray Stevenson as Volstagg

Tadanobu Asano as Hogun

Idris Elba as Heimdall

Rene Russo as Frigga

Adewale Akinnuoye-Agbaje as Algrim / Kurse

Kat Dennings as Darcy Lewis

Stellan Skarsgård as Erik Selvig

Alice Krige as Eir

Clive Russell as Tyr

Jonathan Howard as Ian Boothby

Ramone Morgan as John

Obada Alassadi as Navid

Imaan Chentouf as Maddie

Claire Brown as Volstagg's Wife

Henry Calcutt as Volstagg's Child #1

Ava Caton as Volstagg's Child #2

Abbie McCann as Volstagg's Child #3

Thomas Arnold as Desk Officer

Sam Swainsbury as Stonehenge TV News Reporter

Connor Donaghey as Sad Child

Royce Pierreson as Student

Annabel Norbury as Woman on Platform

Sophie Cosson as Wench #1

Chris O'Dowd as Richard

Justin Edwards as Police Officer #1

Gruffudd Glyn as Police Officer #2

Richard Brake as Einherjar Lieutenant

Stan Lee as Stan Lee

Steve Scott as Steve Scott

Brett Tucker as Einherjar Guard

Talulah Riley as Nurse

Richard Wharton as Asylum Patient

Tony Curran as Bor (uncredited)

Chris Evans as Loki as Captain America (uncredited)

Benicio del Toro as Taneleer Tivan / The Collector (uncredited)

Ophelia Lovibond as Carina (uncredited)

Elsa Pataky as Jane Foster stand-in (uncredited)

Joe Cash as Police Officer (uncredited)

Kamay Lau as Vanir Woman (uncredited)

Alannah Olivia as Library Student (uncredited)