代码覆盖（英语：Code coverage）是软件测试中的一种度量，描述程序中源代码被测试的比例和程度，所得比例称为代码覆盖率。

代码覆盖是由系统化软件测试所衍生的方式。第一份出版的相关参考数据是Miller及Maloney1963年在ACM通讯上发表的论文 。

代码覆盖是飞行设备进行安全认证中的考量项目之一。飞行设备相关认证的指南列在美国联邦航空管理局的文档DO-178B及最近出版的文档DO-178C。 功能安全标准，如IEC 61508或ISO 26262，并未定义代码覆盖率之需求值，只列为软件测试方法的选项，唯有航太产业标准（DO-178B）要求100%，以因应超高可靠度的产品需求，此数值对于工业或汽车产品实属理想目标。

In computer science, code coverage is a measure used to describe the degree to which the source code of a program is tested by a particular test suite. A program with high code coverage has been more thoroughly tested and has a lower chance of containing software bugs than a program with low code coverage. Many different metrics can be used to calculate code coverage; some of the most basic are the percent of program subroutines and the percent of program statements called during execution of the test suite.