The United Soccer Leagues First Division (often referred to as simply, USL-1) is a professional men's soccer league in North America. It is the second division of soccer in the United States and Canada league pyramid behind Major League Soccer. It is managed by the United Soccer Leagues (USL). It was known as the A-League until 2004, having formed from teams from the original A-League.

Unlike most other nations, there is currently no system of promotion and relegation in American soccer.