Queen's Blade (Japanese: クイーンズブレイド, Hepburn: Kuīnzu Bureido) is a Japanese series of visual combat books published by Hobby Japan inspired by the licensed works from Firelight Game Company's Lost Worlds. The overall plot of the game revolves around a tournament called the Queen's Blade, which is held once every four years to determine a Queen.

Since its original release, the series has evolved into a media franchise, spanning four manga adaptations, three anime adaptations, three light novels, and a video game adaptation. Figures of the characters made by various manufacturers, such as Kaiyodo with their Revoltech series, have also been produced along with several memorabilia. A sequel series, Queen's Blade Rebellion, was launched in 2009.