Rachel McAdams
as Sigrit Ericksdottir

Will Ferrell
as Lars Erickssong

Pierce Brosnan
as Erick Erickssong

Dan Stevens
as Alexander Lemtov

Jamie Demetriou
as Kevin Swain

Ólafur Darri Ólafsson
as Neils Brongus

Melissanthi Mahut
as Mita Xenakis

Joi Johannsson
as Jorn

Björn Hlynur Haraldsson
as Policeman - Arnar

Graham Norton
as Graham Norton

Demi Lovato
as Katiana

Jóhannes Haukur Jóhannesson
as Johans

Bobby Lockwood
as Jeff

Elena Saurel
as Stage Manager

Julian Miller
as Janus Skoene

Mikael Persbrandt
as Victor Karlosson

Jon Kortajarena
as Corin Vladvitch

Elina Alminas
as Sasha

Alfrun Rose
as Anna

Elin Petersdottir
as Helka

Christopher Jeffers
as Johnny John John

Rebecca Harrod
as Brittny

Josh Zaré
as Bill

Eleanor Williams
as Jenn

Björn Stefánsson
as Ian

Maxim De Villiers
as French Voter

Chris Lew Kum Hoi
as Jae-Bong

Tómas Lemarquis
as Jiles

Smari Gunn
as Lighting Assistant

Kajsa Mohammar
as Lisa

Gudmundur Thorvaldsson
as Man #1 (1974)

Arnar Jónsson
as Man #2 (1974)

Natasia Demetriou
as Nina

Hannes Óli Ágústsson
as Olaf Yohansson

Hlynur Þorsteinsson
as Policeman - Robert

William Lee Adams
as William Lee Adams

Heidi Niemi
as Stage Manager 2

Chris Beaumont
as Steve Gunderson

Laura Hayden
as The Wonder Four

Joshua Rumble
as The Wonder Four

Harry Balazs
as The Wonder Four

Jackson Couzens
as The Wonder Four

Halldora Thoell
as Woman #1 (1974)

Nína Dögg Filippusdóttir
as Woman #2 (1974)

Alfie Melia
as Young Lars

Mark Adams
as Jon Ola Sand

Zack Propert
as Stephan (Drummer)

Brie Kristiansen
as Ros

Gunnar Cauthery
as Aron

Milan van Weelden
as 21st Century Viking

Alexander Tol
as Dutch Voter

Andrei Zayats
as Czech Republic Voter

Junior Delius
as Dailbour Jinski - Belarus

Daniela Tocari
as Romanian Voter

Tharan Sivapatham
as Airport Attendant

Miguel Angelo
as Portugal Voter

Eveline Suter
as Swiss Voter

Tommy Ashby
as White Snow

Lydia Clowes
as White Snow

Aiste S. Gram
as Aiste Gramantaite

Salvador Sobral
as Salvador Sobral

Marcus Garvey
as Eurovision Director

John Lundvik
as John Lundvik

Anna Odobescu
as Anna Odobescu

Bilal Hassani
as Bilal Hassani

Loreen
as Loreen

Jessy Matador
as Jessy Matador

Alexander Rybak
as Alexander Rybak

Jamala
as Jamala

Elina Nechayeva
as Elina Nechayeva

Conchita Wurst
as Conchita Wurst

Netta
as Netta

Sophia-Grace Donnelly
as Young Sigrit

Trevor Allan Davies
as Old Accordion Player

Spike Jefferson
as Old Bass Player