The War of the Ring was Games Workshop's annual summer campaign for 2005. The campaign was named after the eponymous War of the Ring in J. R. R. Tolkien's The Lord of the Rings, and was the first to feature The Lord of the Rings Strategy Battle Game as its wargaming system. The campaign allowed registered participants to play miniature wargames using special "regional rules" for any one of thirteen regions of Middle-earth, and to submit the results to the campaign website. The results were then added up on the website, contributing to the overall result of the campaign.

Games Workshop Group is a British manufacturer of miniature wargames, based in Nottingham, England. Its best-known products are Warhammer and Warhammer 40,000.