开放文档格式（英语：OpenDocument Format，简称ODF），全称用于办公室应用程序的开放文档格式（Open Document Format for Office Applications），是一种规范，基于XML的文件格式，因应试算表、图表、演示文稿和文字处理文档等电子文档而设置。它的规格原本由升阳电脑开发，标准则由OASIS Open Document Format for Office Applications（OpenDocument）TC（又称为OASIS ODF TC）所开发。存在一个自由与开放的OASIS标准，以ISO/IEC国际标准发布──《ISO/IEC 26300:2015 Open Document Format for Office Applications（OpenDocument）v1.2》。

The Open Document Format for Office Applications (ODF), also known as OpenDocument, is an XML-based file format for spreadsheets, charts, presentations and word processing documents. It was developed with the aim of providing an open, XML-based file format specification for office applications.