Rachel McAdams

Character: Sigrit Ericksdottir

Will Ferrell

Character: Lars Erickssong

Pierce Brosnan

Character: Erick Erickssong

Dan Stevens

Character: Alexander Lemtov

Jamie Demetriou

Character: Kevin Swain

Ólafur Darri Ólafsson

Character: Neils Brongus

Melissanthi Mahut

Character: Mita Xenakis

Joi Johannsson

Character: Jorn

Björn Hlynur Haraldsson

Character: Policeman - Arnar

Graham Norton

Character: Graham Norton

Demi Lovato

Character: Katiana

Jóhannes Haukur Jóhannesson

Character: Johans

Bobby Lockwood

Character: Jeff

Elena Saurel

Character: Stage Manager

Julian Miller

Character: Janus Skoene

Mikael Persbrandt

Character: Victor Karlosson

Jon Kortajarena

Character: Corin Vladvitch

Elina Alminas

Character: Sasha

Alfrun Rose

Character: Anna

Elin Petersdottir

Character: Helka

Christopher Jeffers

Character: Johnny John John

Rebecca Harrod

Character: Brittny

Josh Zaré

Character: Bill

Eleanor Williams

Character: Jenn

Björn Stefánsson

Character: Ian

Maxim De Villiers

Character: French Voter

Chris Lew Kum Hoi

Character: Jae-Bong

Tómas Lemarquis

Character: Jiles

Smari Gunn

Character: Lighting Assistant

Kajsa Mohammar

Character: Lisa

Gudmundur Thorvaldsson

Character: Man #1 (1974)

Arnar Jónsson

Character: Man #2 (1974)

Natasia Demetriou

Character: Nina

Hannes Óli Ágústsson

Character: Olaf Yohansson

Hlynur Þorsteinsson

Character: Policeman - Robert

William Lee Adams

Character: William Lee Adams

Heidi Niemi

Character: Stage Manager 2

Chris Beaumont

Character: Steve Gunderson

Laura Hayden

Character: The Wonder Four

Joshua Rumble

Character: The Wonder Four

Harry Balazs

Character: The Wonder Four

Jackson Couzens

Character: The Wonder Four

Halldora Thoell

Character: Woman #1 (1974)

Nína Dögg Filippusdóttir

Character: Woman #2 (1974)

Alfie Melia

Character: Young Lars

Mark Adams

Character: Jon Ola Sand

Zack Propert

Character: Stephan (Drummer)

Brie Kristiansen

Character: Ros

Gunnar Cauthery

Character: Aron

Milan van Weelden

Character: 21st Century Viking

Alexander Tol

Character: Dutch Voter

Andrei Zayats

Character: Czech Republic Voter

Junior Delius

Character: Dailbour Jinski - Belarus

Daniela Tocari

Character: Romanian Voter

Tharan Sivapatham

Character: Airport Attendant

Miguel Angelo

Character: Portugal Voter

Eveline Suter

Character: Swiss Voter

Tommy Ashby

Character: White Snow

Lydia Clowes

Character: White Snow

Aiste S. Gram

Character: Aiste Gramantaite

Salvador Sobral

Character: Salvador Sobral

Marcus Garvey

Character: Eurovision Director

John Lundvik

Character: John Lundvik

Anna Odobescu

Character: Anna Odobescu

Bilal Hassani

Character: Bilal Hassani

Loreen

Character: Loreen

Jessy Matador

Character: Jessy Matador

Alexander Rybak

Character: Alexander Rybak

Jamala

Character: Jamala

Elina Nechayeva

Character: Elina Nechayeva

Conchita Wurst

Character: Conchita Wurst

Netta

Character: Netta

Sophia-Grace Donnelly

Character: Young Sigrit

Trevor Allan Davies

Character: Old Accordion Player

Spike Jefferson

Character: Old Bass Player

Grant Crookes

Character: Icelandic Bar Patron (uncredited)

Jodie Cuaresma

Character: Icelandic Punter (uncredited)