Liga I (also spelled Liga 1) is a Romanian professional league for men's association football clubs. It is currently sponsored by Orange, and thus officially known as the Liga 1 Orange. At the top of the Romanian football league system, it is the country's primary football competition. Contested by 14 clubs, it operates on a system of promotion and relegation with Liga II. The teams play 26 matches each in the regular season, and then enter the play-off or the play-out according to their position in the regular season. Liga I was established in 1909 and commenced play for the 1909–10 campaign, and is currently ranked 17th in UEFA's league coefficient ranking list. It is administrated by the Liga Profesionistă de Fotbal (LPF). Before the 2006–07 season, it was known as Divizia A, but the name had to be changed following the finding that someone else had registered that trademark.
As of 2016, Liga I ranked first in the number of teams sent to participate in European competitions since 1955. No less than 40 different clubs have played at least one match in European cups.Close