The 2017–18 Czech First League, known as the HET liga for sponsorship reasons, was the 25th season of the Czech Republic's top-tier football league.
The defending champions were Slavia Prague, who won their fourth Czech title the previous season.
[1] The season began on 28 July 2017 and ended on 26 May 2018.
Viktoria Plzeň made a league record by winning their first 14 league games of the season.
[2] Each team plays home-and-away against every other team in the league, for a total of 30 matches played each.