OpenStack是一个美国太空总署和Rackspace合作研发的云端运算软件，以Apache许可证授权，并且是一个自由软件和开放源代码项目。

OpenStack是IaaS（基础设施即服务）软件，让任何人都可以自行创建和提供云端运算服务。

此外，OpenStack也用作创建防火墙内的「私有云」（Private Cloud），提供机构或企业内各部门共享资源。

OpenStack is a free and open-source software platform for cloud computing, mostly deployed as an infrastructure-as-a-service (IaaS). The software platform consists of interrelated components that control hardware pools of processing, storage, and networking resources throughout a data center. Users either manage it through a web-based dashboard, through command-line tools, or through a RESTful API. OpenStack.org released it under the terms of the Apache License.