2017–18 Czech First League

The 2017–18 Czech First League, known as the HET liga for sponsorship reasons, will be the 25th season of the Czech Republic's top-tier football league. The defending champions are Slavia Prague, who won their fourth Czech title (since 1993) the previous season. The season will begin in July 2017 and will end in May 2018.

Teams
The bottom two teams from the previous season, Hradec Králové and Příbram, were relegated to the 2017–18 Czech National Football League. They were replaced by Sigma Olomouc and Baník Ostrava, champions and runners-up respectively of the 2016–17 Czech National Football League; both teams returned to the top-flight at the first time of asking after being relegated the season before.