The 2017–18 Liga I (also known as Liga 1 Betano for sponsorship reasons) was the 100th season of the Liga I, the top professional league for Romanian association football clubs. The season began on 14 July 2017 and ended on 2 June 2018, being the third to take place since the play-off/play-out format has been introduced. Since Romania dropped from 15th to 17th in the UEFA association coefficient rankings, only the title winner qualified for the UEFA Champions League.