Jason Momoa
Arthur Curry / Aquaman

Amber Heard
Mera

Willem Dafoe
Nuidis Vulko

Patrick Wilson
King Orm Marius / Ocean Master

Nicole Kidman
Atlanna

Dolph Lundgren
King Nereus

Yahya Abdul-Mateen II
David Kane / Black Manta

Temuera Morrison
Thomas Curry

Ludi Lin
Captain Murk

Michael Beach
Jesse Kane (Manta's Father)

Randall Park
Dr. Stephen Shin

Graham McTavish
King Atlan

Leigh Whannell
Cargo Pilot

Tainui Kirkwood
Young Arthur (3 Years Old)

Tamor Kirkwood
Young Arthur (3 Years Old)

Denzel Quirke
Young Arthur (3 Years Old)

Kaan Guldur
Young Arthur (9 Years Old)

Otis Dhanji
Young Arthur (13 Years Old)

Kekoa Kekumano
Young Arthur (16 Years Old)

Julie Andrews
Karathen (voice)

John Rhys-Davies
Brine King (voice)

Djimon Hounsou
King Ricou (voice)

Andrew Crawford
Brine King / King Ricou (mocap)

Sophia Forrest
Fisherman Princess

Natalia Safran
Queen Rina

Micah Ohlman
Newscaster

Jack Andrew
Mike (Bully)

Frankie Creagh-Leslie
Matt (Bully)

Sophia Emberson-Bain
Tour Guide (Aquarium)

Ilya Melnikoff
Submarine Captain

Hank Amos
Submarine Pirate

Kyryl Koltsov
Submarine Crew Member

Patrick Cox
Cue Ball

Luke Owen
Biker

Robert Longstreet
Professor James

Devika Parikh
Newscaster Morgan

Sonny Le
Metalsmith

Jon Fabian
Italian Vendor

Mabel Tamone
Italian Young Girl

Rita Dinardo
Italian Old Woman

Anthony Standish
Barfly

Victor Leto
Flower Stall Vendor

Vincent B. Gorce
Italian Bell Father

Gabriella Petkova
Italian Bell Girl

Pearl Grantham
Ancient Atlantean Woman

Noa Tsuchiya
Ancient Atlantean Child

Alice Lanesbury
Arthur's Teacher

Nicolas Bosc
Atlantean Soldier #1

Jordy Campbell
Arthur's Classmate (uncredited)