USL First Division

USL First Division
	Logo from 2005–2010
Organising body	United Soccer League
First season	1996
Folded	2010
Replaced by	USSF D2 Pro (temporary); USL Pro;
Country	United States
Other club(s) from	Canada, Puerto Rico
Confederation	CONCACAF
Level on pyramid	2
Domestic cup(s)	U.S. Open Cup; Canadian Championship;
Most championships	Rochester Rhinos (3)
Most Commissioner's; Cups	Montreal Impact (3)
Most appearances	Mauro Biello (320)
Top goalscorer	Eduardo Sebrango (100)
Broadcaster(s)	Fox Soccer

The USL First Division (USL-1) was a professional men's soccer league in the second tier of the United States league system. It was organized by the United Soccer League as its premier league for men from 1996 to 2010, above the USL Second Division. It began in the 1996 season as the Select League – consisting 21 of the league's best third-tier clubs. It soon merged with the American Professional Soccer League to become the A-League in the 1997 season. It adopted its final name in the 2005 season, following a restructure of the USL.

A controversial sale of Nike's stake in the USL in 2009, along with general animosity between the league and club owners, led to several clubs seceding from the league to form the North American Soccer League (NASL). Amid the dispute, U.S. Soccer organized a mediatory second-tier league with the two warring groups of clubs in 2010. In the 2011 season, the NASL began play as a second-tier league, while the USL merged its First and Second Divisions into a new third-tier league, USL Pro.

Fostering competition between fifty clubs from the United States, Canada, and Puerto Rico over its fifteen seasons of play, eight clubs won the league's championship, with the Rochester Rhinos winning the most (3). Nine clubs won the league's regular season championship – the winners of which were presented the Commissioner's Cup between 2005 and 2009. The Montreal Impact won the most regular season championships (3). As members of the league, the Rhinos and Impact also won a U.S. Open Cup and Canadian Championship, respectively.