The domestic season began on 14 July 2018, with the first round of matches in the 2018–19 Scottish League Cup.

[12] Celtic started in the first qualifying round of the 2018–19 UEFA Champions League, and were drawn against Armenian club Alashkert.

[33]Knockout stage Having finished second in the 2017–18 Scottish Premiership, Aberdeen started in the second qualifying round of the 2018–19 UEFA Europa League.

[34] Rangers started in the first qualifying round of the 2018–19 UEFA Europa League, where they were drawn to play Macedonian club Shkupi.

Hibernian started in the first qualifying round of the 2018–19 UEFA Europa League, and were paired with Faroese club Runavík.