Gerard Butler 
 as King Leonidas

Lena Headey 
 as Gorgo

Dominic West 
 as Theron

David Wenham 
 as Dilios/Narrator

Vincent Regan 
 as Captain

Michael Fassbender 
 as Stelios

Tom Wisdom 
 as Astinos

Andrew Pleavin 
 as Daxos

Andrew Tiernan 
 as Ephialtes

Rodrigo Santoro 
 as Xerxes

Giovani Cimmino 
 as Pleistarchos

Stephen McHattie 
 as Loyalist

Greg Kramer 
 as Ephor #1

Alex Ivanovici 
 as Ephor #2

Kelly Craig 
 as Oracle Girl

Eli Snyder 
 as Leonidas @ 7/8 yrs

Tyler Neitzel 
 as Leonidas @ 15 yrs

Tim Connolly 
 as Leonidas' Father

Marie-Julie Rivest 
 as Leonidas' Mother

Sebastian St. Germain 
 as Fighting Boy (12 years old)

Peter Mensah 
 as Messenger

Arthur Holden 
 as Partisan

Michael Sinelnikoff 
 as Elder Councilman

John Dunn-Hill 
 as Councilman

Dennis St John 
 as Spartan Baby Inspector

Neil Napier 
 as Spartan with Stick

Dylan Smith 
 as Sentry #1

Maurizio Terrazzano 
 as Sentry #2

Robert Paradis 
 as Spartan General

Kwasi Songui 
 as Persian

Alexandra Beaton 
 as Burned Village Child

Frédéric Smith 
 as Statesman

Loucas Minchillo 
 as Spartan Baby A

Nicholas Minchillo 
 as Spartan Baby B

Tom Rack 
 as Ephor #3

David Francis 
 as Ephor #4

James Bradford 
 as Ephor #5

Andrew Shaver 
 as Free Greek-Potter

Robin Wilcock 
 as Free Greek-Sculptor

Kent McQuaid 
 as Free Greek-Blacksmith

Marcel Jeannin 
 as Free Greek-Baker

Jere Gillis 
 as Spartan General #2

Jeremy Thibodeau 
 as Spartan Boy

Tyrone Benskin 
 as Persian Emissary

Robert Maillet 
 as Uber Immortal (Giant)

Patrick Sabongui 
 as Persian General

Leon Laderach 
 as Executioner

Dave Lapommeray 
 as Persian General Slaughtered

Vervi Mauricio 
 as Armless Concubine

Charles Papasoff 
 as Blacksmith

Isabelle Champeau 
 as Mother at Market

Veronique-Natale Szalankiewicz 
 as Daughter at Market (3/5 years old)

Maéva Nadon 
 as Girl at Market

David Thibodeau 
 as Boy #1 at Market

David Schaap 
 as Potter

Jean Michel Paré 
 as Other Council Guard

Stewart Myiow 
 as Persian General

Andreanne Ross 
 as Concubine

Sara Giacalone 
 as Concubine

Ariadne Bourbonnière 
 as Kissing Concubine

Isabelle Fournel 
 as Kissing Concubine

Sandrine Merette-Attiow 
 as Contortionist

Elisabeth Etienne 
 as Dancer

Danielle Hubbard 
 as Dancer

Ruan Vibegaard 
 as Dancer

Geneviève Guilbault 
 as Slave Girl

Bonnie Mak 
 as Slave Girl

Amélie Sorel 
 as Slave Girl

Caroline Aspirot 
 as Slave Girl

Gina Gagnon 
 as Slave Girl

Tania Trudel 
 as Slave Girl

Stéphanie Aubry 
 as Slave Girl

Mercedes Leggett 
 as Slave Girl

Stephania Gambaroff 
 as Slave Girl

Chanelle Lamothe 
 as Slave Girl

Sabrina-Jasmine Guilbault 
 as Slave Girl

Manny Cortez Tuazon 
 as Transsexual (Asian) #1

Cindy 
 as Transsexual (Asian) #2

Atif Y. Siddiqi 
 as Transsexual (Arabian) #3

Camille Rizkallah 
 as Giant with Arrow

Trudi Hanley 
 as Long Neck Woman

Neon Cobran 
 as Litter Bearer/Slave

Gary A. Hecker 
 as Ubermortal Vocals (voice)