The Scottish Professional Football League Challenge Cup, commonly known as the Scottish League Challenge Cup or Scottish Challenge Cup, and currently known as the Tunnock’s Caramel Wafer Challenge Cup for sponsorship reasons, is an association football knock-out cup competition run by the Scottish Professional Football League (SPFL). It was established by the SPFL’s predecessor, the Scottish Football League (SFL) and was originally contested by the 28 or 30 SFL/SPFL teams below the top level in the Scottish football league system. Teams below SPFL level were added in 2011–12, and guest teams from outside Scotland in 2016–17. For the 2019–20 edition there are 58 teams: 30 from the SPFL; the twelve Under-21 teams of the Scottish Premiership clubs; four each from the Highland League and Lowland League; and two guest teams from each of the NIFL Premiership, Cymru Premier League, English National League, and League of Ireland Premier Division.
The competition was first held during the 1990–91 season as the B&Q Centenary Cup to celebrate the 100th anniversary of the formation of the SFL. It was intended to be a one-off competition but was continued due to its popularity. The first winner of the tournament was Dundee, who defeated Ayr United. Falkirk are the most successful team in the tournament, with four wins, most recently in 2012. The most recent winner was Ross County, who defeated Connah’s Quay Nomads in the 2019 final.
The Covid-19 pandemic in Scotland had a significant impact on the competition. The 2019–20 final, between Inverness Caledonian Thistle and Raith Rovers, was originally scheduled for 28 March 2020 but has been indefinitely postponed. Continuing restrictions on fans entering stadiums meant that the competition was unviable for most SPFL clubs, and the scheduled 2020–21 edition was cancelled in October 2020.