The TFF 1. Lig (lit.'TFF 1st League'), currently referred to as Trendyol 1. Lig for sponsorship reasons, is the second level of the Turkish football league system. The league was founded in 2001 as the Turkish Second League Category A after the reorganization of the Second Football League, which was the second level of the Turkish league system between 1963 and 2001. The league was called Türk Telekom Lig A in the 2006–07 season, and was renamed to TFF 1. Lig prior to the 2007–08 season.
