The Lord of the Rings: War of the Ring is a 2003 real-time strategy game (RTS) developed by Liquid Entertainment and published by Sierra Entertainment, a subsidiary of Vivendi Universal Games. Set in J. R. R. Tolkien’s fictional Middle-earth, it expands upon the events of the War of the Ring as told in his fantasy novel, The Lord of the Rings.

War of the Ring is unrelated to the films by Peter Jackson. The game is licensed by Tolkien Enterprises, as are other book-based (as opposed to film-based) Tolkien games such as The Fellowship of the Ring and The Hobbit (2003).