This article is about the video game weapon. For the swordsmith, see Masamune.

The Masamune is the name of a sword that has been featured in many video games, most notably the Final Fantasy series. It has appeared in various incarnations, sometimes just a sword that a character can use during battles and other times it plays a major role in the story.

In the majority of the Final Fantasy series, the Masamune is a sword that is picked up and can be equipped by one of your characters. Depending on the game, the Masamune is either the best weapon or one of the best. It has little impact on the story. One exception is in Final Fantasy VII where the Masamune is not available to you under normal circumstances. It is actually wielded by the main enemy, Sephiroth. In this incarnation, it is an extremely long sword and it is said that only Sephiroth has the strength to wield it.

The Masamune plays a much larger role in the Chrono series (Chrono Trigger, Chrono Cross). It first appears in Chrono Trigger as the legendary holy sword forged by Melchior. Two spirits known as Masa and Mune (who inhabit the sword) guard it. After Crono, Marle, and Lucca successfully pass Masa and Mune's test, they are given the sword. It is then discovered that the sword is broken and needs to be reforged. After acquiring Dreamstone from the distant past, they bring the sword and stone to Melchoir to have it reforged. The process is successful and the sword is presented to Glenn (Frog) to allow him to defeat the dark wizard Magus (and end the curse that makes him look like a frog). After the events of Chrono Trigger, the Masamune is lost during the fall of Guardia.

The sword reappears in Chrono Cross as "the Blood-Stained Sword of Evil". Something has happened that has changed the Masamune from a holy sword to an evil sword. Most likely it happened during the fall of Guardia (the sword is shown covered in blood during the specially added FMV sequence at the end of the PlayStation version of Chrono Trigger). Now the sword draws out the darkest desires and emotions of the wielder until the feelings overwhelm them until they act upon them. For example: if the wielder is extremely jealous of someone, they will kill him or her. This happens to Radius in Chrono Cross when he kills his best friend Garai (who is the number one swordsman). Eventually, Serge and his friends succeed in purging the evil from the sword (in a side quest). Masa and Mune then "wake up" and do not realize what has happened to them and the sword. They then are reunited with their sister Doreen who joins with them to for the Mastermune, Serge's ultimate weapon.

The Masamune has also appeared in the Golden Sun and Soul Calibur series.