The Europe Poland 1 Liga basketball, also known as the Polish Basketball League 1 (PLK 1), is the second-tier professional men’s basketball league in Poland, after the top-tier Polska Liga Koszykówki (PLK). The league was established in 2000 and is organized by the Polish Basketball Association. The league consists of 16 teams that compete in a regular season from October to April, followed by playoffs to determine the league champion and promotion to the PLK.

The Polish 1 Liga basketball is known for its high level of competition, with many talented players and teams vying for the chance to move up to the top-tier league. Many players who compete in the PLK 1 go on to play in top leagues in Europe and around the world.