椭圆曲线迪菲-赫尔曼密钥交换（英语：Elliptic Curve Diffie–Hellman key Exchange，缩写为ECDHE），一种匿名的密钥协定（Key-agreement protocol）。在这个协定下，双方通过迪菲－赫尔曼密钥交换算法，利用由椭圆曲线加密创建的公钥与私钥对，在一个不安全的信道中，创建起安全的共有加密数据。这是迪菲－赫尔曼密钥交换的变种，采用椭圆曲线加密来加强安全性。

Elliptic curve Diffie–Hellman (ECDH) is an anonymous key agreement protocol that allows two parties, each having an elliptic curve public–private key pair, to establish a shared secret over an insecure channel. This shared secret may be directly used as a key, or to derive another key which can then be used to encrypt subsequent communications using a symmetric key cipher. It is a variant of the Diffie–Hellman protocol using elliptic curve cryptography.