Halle Bailey as Ariel

Jonah Hauer-King as Eric

Melissa McCarthy as Ursula

Javier Bardem as King Triton

Noma Dumezweni as The Queen

Art Malik as Sir Grimsby

Daveed Diggs as Sebastian (voice)

Jacob Tremblay as Flounder (voice)

Awkwafina as Scuttle (voice)

Jessica Alexander as Vanessa

Martina Laird as Lashana

Emily Coates as Rosa

Christopher Fairbank as Hawkins

John Dagleish as Mulligan

Matt Carver as Cabin Boy

Jude Akuwudike as Joshua

Lorena Andrea as Perla

Simone Ashley as Indira

Karolina Conchet as Mala

Sienna King as Tamika

Kajsa Mohammar as Karina

Nathalie Sorrell as Caspia

Jodi Benson as Market Vendor

Julz West as Hat Vendor

Shay Barclay as Coconut Seller / Dancer

Arina Li as Flower Vendor

Russell Balogh as Triton Guard #1

Adrian Christopher as Triton Guard #2

Leon Cooke as Core Dancer

Tarik Frimpong as Core Dancer

Chris George as Core Dancer

Yasmin Harrison as Core Dancer

Erica Stubbs as Core Dancer

Kate Thompson as Core Dancer

Jonathan Bishop as Dancer

Aaron Bryan as Dancer

Sophie Carmen-Jones as Dancer

Jon-Scott Clark as Dancer

Cameron Valentina as Dancer

Austyn Farrell as Dancer

Cecil Jee as Dancer

Ben Hukin as Dancer

Andrew Lyle-Pinnock as Dancer

Chanel Mian as Dancer

Ebony Molina as Dancer

Ian Oswald as Dancer

Oliver Ravelin as Dancer

Charles Ruhrmund as Dancer

Craig Stein as Dancer

Nicole Valverde as Dancer

Sasha Watson Lobo as Dancer

Johnny White as Dancer

Charlotte Wilmott as Dancer

Bobby Windebank as Dancer

Clifton Brown as 'Under the Sea' Special Performer

Jeroboam Bozeman as 'Under the Sea' Special Performer

Sarah Daley-Perdomo as 'Under the Sea' Special Performer

Ghrai DeVore-Stokes as 'Under the Sea' Special Performer

Samantha Figgins as 'Under the Sea' Special Performer

Vernard J. Gilmore as 'Under the Sea' Special Performer

Jacqueline Green as 'Under the Sea' Special Performer

Michael Jackson, Jr. as 'Under the Sea' Special Performer

Yannick Lebrun as 'Under the Sea' Special Performer

Renaldo Maurice as 'Under the Sea' Special Performer

Chalvar Monteiro as 'Under the Sea' Special Performer

Danica Paulos as 'Under the Sea' Special Performer

Belen Pereyra as 'Under the Sea' Special Performer

Constance Stamatiou as 'Under the Sea' Special Performer

Jermaine Terry as 'Under the Sea' Special Performer

Ben Marshall as Ship Musician

Matt Quinn as Ship Musician

Sam Sweeney as Ship Musician

Charlotte Bazeley as Merfolk

Noa Nikita Bleeker as Merfolk

Glen Campbell as Merfolk

Sonny Charlton as Merfolk

Marcus Hodson as Merfolk

Alexia Hortal as Merfolk

Janine Johnson as Merfolk

Mia Juul as Merfolk

Jeffin Kunjumon as Merfolk

Jennifer Leung as Merfolk

Mia Maugé as Merfolk

Jacob Maynard as Merfolk

Busola Peters as Merfolk

Stefano Tomadini as Merfolk

Andy Young as Merfolk

Hunter Allen as Merkid

Ava Azizi as Merkid

Zaine Daniel Dillon as Merkid

Mischa Hayward as Merkid

Roy Hu as Merkid

Seyan Patel as Merkid

Taitum Pitfield as Merkid

Eva Polakovs as Merkid

Isabelle Ung as Merkid

Ayo Hana as Stallholder (uncredited)