| Elijah Wood | Frodo Baggins |
| Ian McKellen | Gandalf |
| Viggo Mortensen | Aragorn |
| Sean Astin | Samwise Gamgee |
| Sean Bean | Boromir |
| Billy Boyd | Peregrin "Pippin" Took |
| Dominic Monaghan | Meriadoc "Merry" Brandybuck |
| Ian Holm | Bilbo Baggins |
| Christopher Lee | Saruman |
| Liv Tyler | Arwen |
| John Rhys-Davies | Gimli |
| Orlando Bloom | Legolas |
| Hugo Weaving | Elrond |
| Cate Blanchett | Galadriel |
| Brent McIntyre | Witch-King |
| Sala Baker | Sauron |
| Andy Serkis | Gollum |
| Lawrence Makoare | Lurtz |
| Craig Parker | Haldir |
| Marton Csokas | Celeborn |
| Peter McKenzie | Elendil |
| Mark Ferguson | Gil-Galad |
| Harry Sinclair | Isildur |
| Noel Appleby | Everard Proudfoot |
| Megan Edwards | Mrs. Proudfoot |
| Sarah McLeod | Rosie Cotton |
| David Weatherley | Barliman Butterbur |
| Ian Mune | Bounder |
| Michael Elsworth | Gondorian Archivist |
| Cameron Rhodes | Farmer Maggot |
| Martyn Sanderson | Gate Keeper |
| Billy Jackson | Cute Hobbit Child |
| Katie Jackson | Cute Hobbit Child |
| Alan Howard | The Ring (voice) |
| Victoria Beynon-Cole | Hero Orc / Goblin / Uruk-hai / Ringwraith |
| Paul Bryson | Hero Orc / Goblin / Uruk-hai / Ringwraith |
| Lance Fabian Kemp | Hero Orc / Goblin / Uruk-hai / Ringwraith |
| Phil Grieve | Hero Orc / Goblin / Uruk-hai / Ringwraith |
| Lee Hartley | Hero Orc / Goblin / Uruk-hai / Ringwraith |
| Jonathan Jordan | Hero Orc / Goblin / Uruk-hai / Ringwraith |
| Semi Kuresa | Hero Orc / Goblin / Uruk-hai / Ringwraith |
| Sam La Hood | Hero Orc / Goblin / Uruk-hai / Ringwraith |
| Jono Manks | Hero Orc / Goblin / Uruk-hai / Ringwraith |
| Ben Price | Hero Orc / Goblin / Uruk-hai / Ringwraith |
| Chris Streeter | Hero Orc / Goblin / Uruk-hai / Ringwraith |
| Clinton Ulyatt | Hero Orc / Goblin / Uruk-hai / Ringwraith |
| Peter Jackson | Albert Dreary / Painting of Bungo Baggins (uncredited) |
| Chris Ryan | Breelander (uncredited) |
| Bret McKenzie | Figwit (uncredited) |
| Betty Adams | Hobbit (uncredited) |
| Timothy Bartlett | Hobbit (uncredited) |
| Bob Blackwell | Hobbit (uncredited) |
| David Houma | Hobbit (uncredited) |
| Jo Surgison | Hobbit (uncredited) |
| Liz Merton | Hobbit Band Member (uncredited) |
| Zo Hartley | Kissing Hobbit (uncredited) |
| Norman Cates | Party Hobbit (uncredited) |
| Jeff Kingsford-Brown | Party Hobbit (uncredited) |
| Marta Martí | Village Female Hobbit (uncredited) |
| Riley Brophy | Cute Hobbit Child (uncredited) |
| Phoebe Gittins | Cute Hobbit Child (uncredited) |
| Taea Hartwell | Cute Hobbit Child (uncredited) |
| Shane Rangi | Witch-King (uncredited) |
| Jed Brophy | Ringwraith (uncredited) |
| Paul Shapcott | Burning Ringwraith (uncredited) |
| Alan Lee | Ring King of Men (uncredited) |
| Larry Rew | Ring King of Men (uncredited) |
| Gino Acevedo | Ring Dwarf-Lord (uncredited) |
| Xander Forterie | Ring Dwarf-Lord (uncredited) |
| Richard Maybery | Ring Dwarf-Lord (uncredited) |
| Sabine Crossen | Rivendell Elf (uncredited) |
| Gareth Jensen | Rivendell Elf (uncredited) |
| Ben Britton | Last Alliance Elf / Rivendell Elf (uncredited) |
| Kester Fordham | Last Alliance Elf / Rivendell Elf (uncredited) |
| Jarl Benzon | Last Alliance Elf (uncredited) |
| Sam Kelly | Last Alliance Elf / Council Elf (uncredited) |
| Matt Appleton | Council Elf (uncredited) |
| Blair Morton | Council Elf (uncredited) |
| Ray Henwood | Council Man (uncredited) |
| Ralph Johnson | Council Man / Orc (uncredited) |
| Jonathan Harding | Council Elf / Lothlorien Elf (uncredited) |
| Jørn Benzon | Lothlorien Elf (uncredited) |
| Ben Fransham | Lothlorien Elf / Goblin / Uruk-hai (uncredited) |
| Tim Kano | Gondorian Citizen (uncredited) |
| Sacha Lee | Arms of Gollum (uncredited) |
| Thomas Robins | Hand of Gollum (uncredited) |
| Randall William Cook | Cave Troll (uncredited) |
| Rachel Clentworth | Goblin (uncredited) |
| Lani Jackson | Goblin (uncredited) |
| Sharon Maxwell | Goblin (uncredited) |
| David J. Muzzerall | Goblin (uncredited) |
| Winham Hammond | Goblin / Orc / Uruk-hai (uncredited) |
| Mana Hira Davis | Goblin / Orc / Uruk-hai (uncredited) |
| Warren Green | Isengard Orc Blacksmith (uncredited) |
| Stu Johnson | Isengard Orc Blacksmith (uncredited) |
| Peter Lyon | Isengard Orc Blacksmith (uncredited) |
| Peter Daube | Khai (uncredited) |
| Samuel E. Shore | Refugee / Orc (uncredited) |
| Rodney Bane | Orc (uncredited) |
| Daniel Andrews | Orc / Uruk-hai (uncredited) |
| Siaosi Fonua | Orc / Uruk-hai (uncredited) |
| Ken Stratton | Isengard Orc / Last Alliance Soldier / Morgul Orc / Uruk-hai (uncredited) |
| Lynden Berrymen | Uruk-hai at Amon Hen (uncredited) |
| Ryan Carey | Uruk-hai (uncredited) |
| Tack Daniel | Uruk-hai (uncredited) |
| Shane Dawson | Uruk-hai (uncredited) |
| Branko Dordevich | Uruk-hai (uncredited) |
| Greg Lane | Uruk-Hai (uncredited) |
| Tim McLachlan | Uruk-hai (uncredited) |
| Dean Morganty | Uruk-hai (uncredited) |
| Greg Morrison | Uruk-hai (uncredited) |
| Andrew Munro | Uruk-hai (uncredited) |
| Grant Roa | Uruk-hai (uncredited) |
| Vincent Roxburgh | Uruk-hai (uncredited) |
| Mike Stearne | Uruk-hai (uncredited) |
| Andrew Stehlin | Uruk-hai (uncredited) |
| Tim Wong | Uruk-hai (uncredited) |