PSS, Semen Padang, and Kalteng Putra joined as the promoted teams from the 2018 Liga 2.
They replace Mitra Kukar, Sriwijaya, and PSMS who were relegated to the 2019 Liga 2.
[6] On 2 December 2019, Bali United won the championship for the first time in their history, becoming the seventh club to win the Liga 1 following a win against Semen Padang, after second-placed Borneo drew against PSM, giving Bali United a 17-point lead with only four games left.
The new teams this season were PSS, Semen Padang, and Kalteng Putra, who replaced Mitra Kukar, Sriwijaya, and PSMS.
Notes: Additionally, referee kits are made by Specs[62] and Mitre supplied the match ball.