The 2017–18 Promotion League season is the 6th edition (the 4th since its name change) of the 3rd division of Swiss Football and is the third level of the football hierarchy in Switzerland, behind the Super League and the Challenge League. The Championship has 16 teams and each team plays 30 games.
FC Le Mont LS, which he had not received the license III in the 1st instance, has decided not to appeal. The club also decides that the team will also not play in Promotion League. FC United Zurich, 15th in the 2016-2017 season, is maintained in Promotion League. The 2017-2018 season started on 2 August 2017 and will finish on 26 May 2018.