《勇者斗恶龙怪兽系列》（日语：ドラゴンクエストモンスターズ，英语：Dragon Quest Monsters）是勇者斗恶龙系列的一个外传游戏系列。原本由艾尼克斯开发，现在则由合并后的史克威尔艾尼克斯开发。其游戏背景为一充满魔法、怪物和召唤师的中世纪世界。这系列游戏最大特色不同于原本的勇者斗恶龙系列，勇者斗恶龙怪兽系列中由玩家操控的角色不能亦不需在战斗过程中作出任何攻击及防御，而是透过召唤兽作战。召唤兽获得的方法则是透过捕获、交配与交换。而这个概念源自《勇者斗恶龙V》。游戏的怪物与角色是由龙珠创作者鸟山明所设计的。该系列使用不同的游戏系统并获得正面的评价，但在美国被认为是「复制神奇宝贝」。

Dragon Quest Monsters(ドラゴンクエストモンスターズ,Doragon Kuesuto Monsutāzu) or Dragon Warrior Monsters, as it was known in North America, is a spin-off series of the Dragon Quest games. Published by Enix Corporation (now known as Square Enix), it sets the player in a medieval/fantasy world filled with magic, monsters and knights. Unlike the original Dragon Quest games, the player's character does not do any of the fighting in battles; instead the player has to rely on capturing, breeding and raising monsters to do the fighting for them. The concept originated from Dragon Quest V (1992). The character and monster designs are by Dragon Ball creator, Akira Toriyama. The series spans several handheld gaming systems and each game has received positive reviews from critics. Upon the series' debut in the US, it was quickly labeled as a "Pokémon clone" by critics.