Vagrant Story is an action role-playing game developed and published by Square (now Square Enix) for the PlayStation video game console. The game was released in 2000, and has been re-released through the PlayStation Network for the PlayStation 3, PlayStation Portable and PlayStation Vita consoles. Vagrant Story was primarily developed by the team responsible for Final Fantasy Tactics, with Yasumi Matsuno serving as producer, writer and director.

The game takes place in the fictional kingdom of Valendia and the ruined city of Leá Monde. The story centers on Ashley Riot, an elite agent known as a Riskbreaker, who must travel to Leá Monde to investigate the link between a cult leader and a senior Valendian Parliament member, Duke Bardorba. In the prologue, Ashley is blamed for murdering the duke, and the game discloses the events that happen one week before the murder.

Vagrant Story is unique as a console action-adventure role-playing game in that it features no shops and no player interaction with other characters; instead, the game focuses on weapon creation and modification, as well as elements of puzzle-solving and strategy. The game received critical acclaim from gaming magazines and websites.

Vagrant Story is a solo action role-playing game, in which the player controls Ashley Riot from a third-person perspective while exploring Leá Monde and the catacombs underneath. The player may also switch into first-person perspective to allow for a 360° view using the START button or right analog stick on the game controller. Characters and sprites are proportionate with each other, and the player navigates Ashley on a three-dimensional field map. Navigation is in real-time, and areas accessed by the player are stored in an in-game map menu.

Ashley can run, jump, and push crates and cubes to navigate around obstacles, adding puzzle and platforming elements to gameplay. During the game, the player must sometimes solve block puzzles to advance the story. When the player returns to a completed block puzzle room, a time-attack mode called "Evolve, or Die!!" begins. Players must reach the end of the room in the shortest time possible, after which they are ranked. This stage is optional and can be turned off from the menu.

In the field map, players may engage the enemy as soon as they enter Battle Mode, which uses a pausable real-time combat system, much like Square's Parasite Eve (1998). In Battle Mode, when the player taps the attack button, a spherical grid appears around Ashley. Individual body parts within this sphere can be targeted. The battle system involves the player chaining different attacks known as Chain Abilities to achieve large combos and deal damage to the enemy. This is done by pressing buttons in timely succession, making combat resemble a rhythm game. In addition to Chain Abilities, Defensive Abilities allow Ashley to reduce or reflect damage or avoid status ailments. Ashley also gains Break Arts, which exchange his hit points (HP) for increased damage.