信息技术基础架构库(Information Technology Infrastructure Library，ITIL)是用来管理信息技术 (IT) 的架构设计，研发和操作的一整套概念和思想。

主要精神为和谐推动及持续改善，将服务对象视为客户，强调End-to-End的服务。

ITIL最初是借由一套书籍发布。这套书籍的每一本都涵盖一个信息技术的领域。ITIL这个名称和IT Infrastructure Library都是英国政府商务办公室 (OGC)的注册商标。借由为不同的IT组织量身定制一些复杂的清单，任务，流程，ITIL为许多重要的IT时间准则给出了详尽的解释。

ITIL, formerly an acronym for Information Technology Infrastructure Library, is a set of practices for IT service management (ITSM) that focuses on aligning IT services with the needs of business. In its current form (known as ITIL 2011 edition), ITIL is published as a series of five core volumes, each of which covers a different ITSM lifecycle stage. Although ITIL underpins ISO/IEC 20000 (previously BS 15000), the International Service Management Standard for IT service management, there are some differences between the ISO 20000 standard and the ITIL framework.