Halle Bailey

Ariel

Jonah Hauer-King

Eric

Melissa McCarthy

Ursula

Javier Bardem

King Triton

Noma Dumezweni

The Queen

Art Malik

Sir Grimsby

Daveed Diggs

Sebastian (voice)

Jacob Tremblay

Flounder (voice)

Awkwafina

Scuttle (voice)

Jessica Alexander

Vanessa

Martina Laird

Lashana

Emily Coates

Rosa

Christopher Fairbank

Hawkins

John Dagleish

Mulligan

Jude Akuwudike

Joshua

Lorena Andrea

Perla

Simone Ashley

Indira

Karolina Conchet

Mala

Sienna King

Tamika

Kajsa Mohammar

Karina

Nathalie Sorrell

Caspia

Jodi Benson

Market Vendor

Russell Balogh

Triton Guard #1

Adrian Christopher

Triton Guard #2

Leon Cooke

Core Dancer

Tarik Frimpong

Core Dancer

Yasmin Harrison

Core Dancer

Erica Stubbs

Core Dancer

Sophie Carmen-Jones

Dancer

Jon-Scott Clark

Dancer

Craig Stein

Dancer

Sasha Watson Lobo

Dancer

Johnny White

Dancer

Bobby Windebank

Dancer

Marcus Hodson

Merfolk

Jacob Maynard

Merfolk

Taitum Pitfield

Merkid

Ayo Hana

Stallholder (uncredited)