QUIC，名称来自快速UDP网络连接（英语：Quick UDP Internet Connections）的缩写，一种实验性的传输层网络传输协定，由Google公司开发，在2013年实作出来。QUIC使用UDP协定，在两个端点间创建连接，支持多路复用连接。在设计之初，QUIC希望能够提供等同于SSL/TLS层级的网络安全保护。减少数据传输及创建连接时的延迟时间，双向控制带宽，以避免网络拥塞。Google希望使用这个协定，来取代TCP协定，使网页传输速度加快，计划将QUIC提交至互联网工程任务小组（IETF），让它成为下一代的正式网络规范。

QUIC (Quick UDP Internet Connections, pronounced quick) is an experimental transport layer network protocol designed by Jim Roskind at Google, initially implemented in 2012, and announced as experimentation broadened in 2013. QUIC supports a set of multiplexed connections between two endpoints over User Datagram Protocol (UDP), and was designed to provide security protection equivalent to TLS/SSL, along with reduced connection and transport latency, and bandwidth estimation in each direction to avoid congestion. QUIC's main goal is to improve perceived performance of connection-oriented web applications that are currently using TCP. It also provides a venue for rapid iteration of congestion avoidance algorithms, placing control into application space at both endpoints, rather than (the relatively slow to evolve) kernel space.