Jason Momoa as Arthur

Patrick Wilson as Orm

Yahya Abdul-Mateen II as Black Manta

Randall Park as Dr. Shin

Amber Heard as Mera

Nicole Kidman as Atlanna

Dolph Lundgren as King Nereus

Temuera Morrison as Tom

Indya Moore as Karshon

Pilou Asbæk as Kordax

Jani Zhao as Stingray

Vincent Regan as Atlan

Martin Short as Kingfish (voice)

John Rhys-Davies as Brine King (voice)

Natalia Safran as Council Lady

Samuel Gosrani as Mercenary Tech

Jay Rincon as Scientist #1

Sohm Kapila as Reporter

Ricardo Molina as Reporter

Ingrid Bisu as Pier Waitress

Grant Huggair as Surface Dweller

Osian Roberts as Atlantean Fighter Pilot #2

Jonny Vaughton as Atlantean Fighter Pilot #1

Jay McDonald as Ocean Freighter Captain

Jonathan Bremner as Octobot Mercenary #1

Jack Waldouck as Octobot Mercenary #2

Tyler Burger as Junior Baby

Maddox Cruz-Porter as Junior Baby

River Ao Moemoeā Green as Junior Baby

Nikau Keats Green as Junior Baby

Bodhi McCabe as Junior Baby

Elliot Oben-Perpa as Junior Baby

Lucian Oben-Perpa as Junior Baby

Arthur Rowe-Mayer as Junior Baby

Noah Rowe-Mayer as Junior Baby

Julie Chang as Reporter

Mark Kwak as Reporter

Dylan Silver as Reporter

Jon Birkbeck as Orm Suit Performer

Michael Beach as Jesse Kane (archive footage) (uncredited)

Michael Oladele as Marine Warrior (uncredited)