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- Bernard Hill as Théoden: the King of Rohan who, after triumphing at Helm's Deep, is preparing his troops for the Battle of the Pelennor Fields.
- Billy Boyd as Pippin Took: a hobbit who came along with his friend Frodo and is now caught in the wars.
- Dominic Monaghan as Merry Brandybuck: a cousin of Frodo's who becomes an esquire of Rohan.
- Orlando Bloom as Legolas: an elven prince of Mirkwood and skilled archer who aids Aragorn in his quest to reclaim the throne.
- Hugo Weaving as Elrond: the Elven-King of Rivendell and father or Arwen.
- Miranda Otto as Éowyn: Théoden's niece, who wishes to prove herself in battle and starts to fall in love with Aragorn.
- David Wenham as Faramir: a prince of the Stewards of Gondor and Captain of the Rangers defending Osgiliath, who seeks his father's love in vain.
- Karl Urban as Éomer: Éowyn's brother, who serves as Chief Marshal of the Riders of Rohan and heir to his uncle's throne.
- John Noble as Denethor: the Steward of Gondor and father of Faramir and Boromir, whose grief over Boromir's death and despair over Mordor's superior numbers drive him into madness during the Siege of Gondor.
- Andy Serkis as Gollum: a wretched and treacherous hobbit-like creature who kept the Ring for centuries and now guides Frodo and Sam into Mordor.
- Ian Holm as Bilbo Baggins: Frodo's elderly uncle, who has rapidly aged after giving away the Ring.
- Marton Csokas as Celeborn: the Elven-King of Lothlórien.
- Lawrence Makoare as the Witch-King of Angmar: the lord of the Nazgûl, who leads Mordor's assault on Minas Tirith. Makoare also plays Gothmog: an Orc commander.
- Thomas Robins as Déagol: Sméagol's cousin.