《ICO》（中文名：古堡迷踪）是由ICO小组制作的游戏。主创者上田文人承担了大量开发工作，开始在玩家群体中获得较高的声望。游戏原计划运行于初代PlayStation，后因受到机能限制转而成为PlayStation 2独占游戏。游戏开发历时四年，团队特别雇佣了一个“裁剪小组”，致力于简化游戏中不必要的元素，以增强游戏的代入感。

《ICO》在剧情讲述和动画制作方面都有出色的表现：用极少的对话讲述了令人回味的剧情，用高光和关键格等技术制作了比同时代游戏先进的动画，影响了后来的很多游戏作品。《ICO》于商业上未成功，却因其独有的艺术元素（如充满古典氛围的古堡室内场景）成名，获得多个“年度游戏”和“游戏设计师选择”奖项或提名。《ICO》也常在许多游戏榜单中占据前席，被认为是一款出色的艺术品。

Ico(イコ,Iko, /ˈiːkoʊ/) is a puzzle-platformer and action-adventure video game developed by Team Ico and published by Sony Computer Entertainment, released for the PlayStation 2 video game console in 2001 and 2002 in various regions. It was designed and directed by Fumito Ueda, who wanted to create a minimalist game around a "boy meets girl" concept. Originally planned for the PlayStation, Ico took approximately four years to develop. The team employed a "subtracting design" approach to reduce elements of gameplay that interfered with the game's setting and story in order to create a high level of immersion.