The 2015–16 Scottish Challenge Cup, known as the Petrofac Training Cup due to sponsorship reasons with Petrofac, is the 25th season of the competition. It is being competed for by 32 clubs, which include the 30 members of the 2015–16 Scottish Championship, 2015–16 Scottish League One and 2015–16 Scottish League Two, the top 2014–15 Highland Football League club with a valid SFA club licence (Brora Rangers) and the highest placed team from the 2014–15 Lowland Football League with a valid SFA club licence (Edinburgh City).