安全关联（英语：Security association，缩写为SA），又译为安全性关联、安全群组、安全参数组合，为了提供安全的通信环境，在两个网络实体之间，所创建起的共享网络安全属性。一个安全关联中，在网络连接前，要先交换网络数据参数，包含了加密模式与加密算法，安全加密密钥等。网络安全关联与密钥管理协定（Internet Security Association and Key Management Protocol，缩写为ISAKM，或ISAKMP）提供了安全关联的基础框架。互联网密钥交换（IKE 或 IKEv2）提供了密钥交换的机制。

A Security Association (SA) is the establishment of shared security attributes between two network entities to support secure communication. An SA may include attributes such as: cryptographic algorithm and mode; traffic encryption key; and parameters for the network data to be passed over the connection. The framework for establishing security associations is provided by the Internet Security Association and Key Management Protocol (ISAKMP). Protocols such as Internet Key Exchange and Kerberized Internet Negotiation of Keys provide authenticated keying material.