The regular season began on 29 September 2018 and concluded on 17 March 2019.
[1] The league took a mid-season break for around one month from 17 December 2018 to early January 2019 due to India's participation in the 2019 AFC Asian Cup.
[1] Chennaiyin were the defending champions, having defeated Bengaluru in the 2018 final, however they did not qualify for the playoffs having finished the last in the regular season.
Bengaluru FC became the first team who won the ISL Championship as well as after topped the league stage.
[2][3] The number of foreign players allowed in the squad will be reduced from eight to seven from 2018 to 2019 season, however the maximum number of foreign players allowed on the pitch will remain same at five.