《假面骑士圣刃》（原文：仮面ライダー圣刃/Kamen Rider Saber）是东映株式会社出品的特摄电视剧。是“令和假面骑士”系列第二作。本作以“神话”与“书”为元素，敌人是来自不可思议的异世界潜入的魔物。
Since ancient times, there have been books responsible for all of Earth's civilisation. These books were written with all sorts of myths, stories, living things, sources of science and technology.The book was protected by the "Holy Sword" and the "Selected Swordsman", keeping the world in balance. However, thousands of years ago, an attempt was made to steal the books. The books were scattered around the world and disappeared. This battle raged on in secret.In the present day, novelist Kamiyama Touma has a recurring dream: In another world, a swordsman fights a fierce battle with a monster in a book, and a mysterious girl seeks help. Every time he dreams about it, Touma is caught in the feeling that he is forgetting something important, but he doesn't know what that is or who the girl is. It seems that everyday life can collapse so easily. The dream always happens without warning.Suddenly, a strange phenomenon occurs where part of the city disappears. Important family members, friends...