点对点隧道协议（英语：Point to Point Tunneling Protocol，缩写为PPTP）是实现虚拟私人网络（VPN）的方式之一。PPTP使用传输控制协议（TCP）创建控制信道来发送控制命令，以及利用通用路由封装（GRE）信道来封装点对点协议（PPP）封包以发送数据。这个协议最早由微软等厂商主导开发，但因为它的加密方式容易被破解，微软已经不再建议使用这个协议。

PPTP的协定规范本身并未描述加密或身份验证的部份，它依靠点对点协议（PPP）来实现这些安全性功能。因为PPTP协定内置在微软窗口系统家族的各个产品中，在微软点对点协议（PPP）协议堆栈中，提供了各种标准的身份验证与加密机制来支持PPTP 。 在微软窗口系统中，它可以搭配PAP、CHAP、MS-CHAP v1/v2或EAP-TLS来进行身份验证。通常也可以搭配微软点对点加密（MPPE）或IPSec的加密机制来提高安全性。

The Point-to-Point Tunneling Protocol (PPTP) is a method for implementing virtual private networks. PPTP uses a control channel over TCP and a GRE tunnel operating to encapsulate PPP packets.

The PPTP specification does not describe encryption or authentication features and relies on the Point-to-Point Protocol being tunneled to implement security functionality. However, the most common PPTP implementation shipping with the Microsoft Windows product families implements various levels of authentication and encryption natively as standard features of the Windows PPTP stack. The intended use of this protocol is to provide security levels and remote access levels comparable with typical VPN products.