Hyakushiki-Masamune, also known as Masamune 100, may refer to:
- The weapon from Final Fantasy Tactics Advance.
- The weapon from Final Fantasy Tactics A2: Grimoire of the Rift.
Hyaku shiki means "100 seasons" in Japanese.
Masamune Okazaki, a legendary Japanese blacksmiths of the Kamakura Era employed under the Kamakura Shogunate. He was famous for his forging process of soshu kitae and nijuba, the strongest method for the body of katana, layering different consistencies of carbon steel for tensile composition and in such a way they were forged twice.The Masamune is named after
His works were often compared to those of Muramasa, though always the better of the two. According to legend, the two swordsmiths set a sword of their making into a nearby stream as contest to see who made the better sword, with Masamune's blade said to have ignored all things that came near it. Though Muramasa belittled Masamune, a monk came to be the final judge and praised Masamune's swords for having benevolence. From this tale, Masamunes are said to be the marks of an internal peaceful and calm warrior, the opposite of Muramasas.