Sophie Turner as Jean Grey / Dark Phoenix

James McAvoy as Charles Xavier / Professor X

Nicholas Hoult as Hank McCoy / Beast

Tye Sheridan as Scott Summers / Cyclops

Michael Fassbender as Erik Lensherr / Magneto

Alexandra Shipp as Ororo Munroe / Storm

Evan Peters as Peter Maximoff / Quicksilver

Jessica Chastain as Vuk

Kodi Smit-McPhee as Kurt Wagner / Nightcrawler

Jennifer Lawrence as Raven Darkholme / Mystique

Scott Shepherd as Dr. John Grey

Ato Essandoh as Jones

Brian d'Arcy James as President of the United States

Halston Sage as Alison Blaire / Dazzler

Lamar Johnson as Ben Hammil / Match

Summer Fontana as Young Jean Grey

Hannah Emily Anderson as Elaine Grey

Josh McLaglen as Hospital Doctor

Todd Hallowell as Hospital Doctor

Julianne Jain as Hospital Doctor

Michael Kives as Launch Reporter

Karen Ivany as Launch Anchor

Lynne Adams as NASA Flight Director

Alex Gravenstein as NASA Tech

Daniel Rindress-Kay as NASA Tech

Raphael Grosz-Harvey as NASA Tech

Orphée Ladouceur-Nguyen as NASA Tech

Richard Dagenais as News Anchor

Dan Duran as News Anchor

Isabel Farias Lehoux as Brazilian News Anchor

Gryffin Hanvelt as Brazilian Kid

Emilio La Torre as Brazilian Kid

Julian Bailey as Shuttle Commander

André Bédard as Shuttle Astronaut

Michael Lipka as Shuttle Astronaut

Robert Montcalm as Shuttle Astronaut

Sebastian MacLean as Shuttle Astronaut

Vanessa Jackson as Shuttle Astronaut

David Patrick Green as NASA Press Conference Speaker

Sean Dennis as Military Police

Eloi Archambaudoin as Dinner Party Guest

Yanek Gadzala as Dinner Party Guest

Aphra Williams as Dinner Party Guest

Maurizio Terrazzano as Dinner Party Guest

Simon Alain as Dinner Party Guest

Sébastien Bolduc as Woods Party Mutant

Chris Claremont as White House Guest

Matt Keyes as Cop

Suzanna Lenir as Cop

Amir Sám Nakhjavani as Cop

Donny Falsetti as Cop

Brady Allen as Mutant Student

Dave Campbell as Detective

Andrew Stehlin as Ariki

Kota Eberhardt as Selene Gallio

Tyler Elliot Burke as Genosha Sentry

Danny Blanco Hall as Army Ranger Captain

Aalia Adam as Local Reporter

Peter Anthony Holder as Local Reporter

Christopher B. MacCabe as Dive Bar Bartender

Frank Fontaine as Dive Bar Elderly Man

Bonkers as 5th Avenue Dog

Sébastien Beaulac as National Guard Officer

Alain Chanoine as Military Train Guard

Doug Chapman as Military Train Guard

Frédéric North as Helicopter Pilot

Brian A. Reynolds as Helicopter Pilot

Doug Uttecht as Helicopter Pilot

Ben Skorstad as Helicopter Pilot

Warren Harris as Helicopter Pilot

Melissa Toussaint as UN Delegate Haiti (uncredited)

Craig Snoyer as UN Guard (uncredited)

Tony Saquett as Mutant (uncredited)

Stephane Ouellet as National Guard (uncredited)

Xavier Sotelo as UN Delegate Spain (uncredited)

Olivier Lamarche as Local Cop (uncredited)

Christian Labbé as CIA Agent (uncredited)

Guy Iannacone as National Guard (uncredited)

Eldon Hunter as Journalist (uncredited)

Christopher Hayes as UN Reporter #1 (uncredited)

Amélie Hadouchi as Girl on the Bus (uncredited)

Frédéric Gilles as World Leader #1 (uncredited)

Julien Irwin Dupuy as Helicopter Pilot 1 (uncredited)

Marine Buton as French waitress (uncredited)

Daniel Cudmore as (uncredited)

Ilyes Belayel as NYPD (uncredited)

George Chiang as Chinese UN Reporter (uncredited)

Éric Clark as U.N. Lead Guard (uncredited)

Alexandre Bélanger as Businessman (uncredited)

Joey Coleman as Jean Grey's Uncle (uncredited)