2018 Liga 1 (Indonesia)
The 2018 Liga 1, also known as Go-Jek Liga 1 for sponsorship reasons, was the 2nd season of Liga 1 under its current name and the 9th season of the top-flight Indonesian professional league for association football clubs since its establishment in 2008. The season started on 23 March 2018 and ended on 9 December 2018. Fixtures for the 2018 season were announced on 10 March 2018.
Bhayangkara were the defending champions. Persebaya, PSMS, and PSIS joined as the promoted teams from the 2017 Liga 2. They replaced Persegres, Persiba, and Semen Padang, which were relegated to the 2018 Liga 2.
Persija won their first Liga 1 title, and second Indonesian top-flight title overall on the final day of the season, finishing on 62 points.
Overview
Player regulations
Player registration was divided into two periods. The first period opened from 10 February 2018 and closes on 5 April 2018. Then the second period was done on 5 July to 3 August 2018. Clubs could register at least 18 players and a maximum of 30 players. The club was also required to contract at least seven local U-23 players. Unlike last season, U-23 players were not required to play in one game.Persija and Bali United got privileges related to player quota. Both were allowed to add three local players with no age limit, following their participation in the 2018 AFC Cup representing Indonesia.
Referee
Unlike last season, the league operator ensured that they did not use any foreign referees for this season.Teams
Eighteen teams competed in the league – the top fifteen teams from the previous season and three teams promoted from the Liga 2. The new teams this season were Persebaya, PSMS, and PSIS, who replaced Persegres, Persiba, and Semen Padang.Name changes
| Team | Location | Stadium | Capacity |
| Arema | Malang | Kanjuruhan | 42,449 |
| Bali United | Gianyar | Kapten I Wayan Dipta | 22,931 |
| Barito Putera | Banjarmasin | May 17th | 15,000 |
| Bhayangkara | Jakarta | PTIK | 3,000 |
| Borneo | Samarinda | Segiri | 16,000 |
| Madura United | Pamekasan | Gelora Ratu Pamelingan | 15,000 |
| Mitra Kukar | Tenggarong | Aji Imbut | 35,000 |
| Persebaya | Surabaya | Gelora Bung Tomo | 55,000 |
| Persela | Lamongan | Surajaya | 16,000 |
| Perseru | Serui | Marora | 5,000 |
| Persib | Bandung | Gelora Bandung Lautan Api | 38,000 |
| Persija | Jakarta | Gelora Bung Karno | 77,193 |
| Persipura | Jayapura | Mandala | 30,000 |
| PS TIRA | Bantul | Sultan Agung | 35,000 |
| PSIS | Magelang | Moch. Soebroto | 20,000 |
| PSM | Makassar | Andi Mattalata | 15,000 |
| PSMS | Medan | Teladan | 20,000 |
| Sriwijaya | Palembang | Gelora Sriwijaya | 23,000 |
Notes:
Personnel and kits
Note: Flags indicate national team as has been defined under FIFA eligibility rules. Players and coaches may hold more than one non-FIFA nationality.| Team | Head coach | Captain | Shirt Sponsor | ||||
| Arema |  Coaching changes
ResultsSeason statisticsTop goalscorers
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