Tales of the World: Summoner's Lineage (テイルズオブザワールド サモナーズリネージ, Teiruzu Obu Za Waarudo Samonaazu Rineeji) is a tactical role-playing game developed and published by Namco and released in Japan for the Game Boy Advance on March 7, 2003. Tales of the World: Summoner's Lineage's characteristic genre name is Fantasy Simulation RPG (ファンタジーシミュレーションRPG, Fantajī shimyurēshon RPG). As part of the Tales series, it retains several familiar features while adding new ones.

The game acts as a follow-up to the events of Tales of Phantasia, with the main character, Fulein Lester, actually being a descendant of the character Claus Lester from the aforementioned title. It is the second sequel to Tales of Phantasia, after Tales of Phantasia: Narikiri Dungeon.

Though structurally quite different from the usual Tales games, Summoner's Lineage features items and enemies that were seen in other titles. In this game, characters are moved across a grid-like board, only going into combat once they have moved themselves close enough to an enemy. It is then that they will enter combat and be able to issue various commands such as physical attacks and magic spells in order to defeat their opponent. Each character and enemy is given an elemental alignment that determines which attacks will be best suited to defeating them (a "fire" character would take more damage from a water-based attack, for instance).

These differences in structure can be attributed to the fact that Summoner's Lineage is actually a gameplay sequel to a Japanese Namco Game Boy Color game called Pocket King,[1] a sequel to the 1988 Famicom title King of Kings (featured in Namco Anthology 2).

In addition to the principal characters of Tales of Phantasia, the player can also utilize Fulein's ability to summon several different kinds of creatures to aid in battle. These monsters, like any other character, have their own unique statistics and attacks, as well as their own ways of approaching combat.