2023–24 Czech First League

The 2023–24 Czech First League, known as the Fortuna liga for sponsorship reasons, was the 31st season of the Czech Republic's top-tier football for professional clubs since its establishment, in 1993. Sparta Prague were the reigning champions. The season was scheduled to start in July 2023. The first half of the season had 19 rounds, finishing in December, and the other half commenced in February 2024. The season ended on 31 May 2024 with two extra play-out fixtures on 29 May and 2 June 2024.

In the 12th round, the highest number of goals in one game in the history of the Czech First League was seen in the match Zlín–Mladá Boleslav, which ended 5–9.

Format
The season format is unchanged from last season, each team will play in the league format home and away matches. The lowest-ranked team will be relegated directly to the second league, and the two teams positioned 14th and 15th will play a play-out with two teams from the second league positioned 2nd and 3rd in a home and away format. This will be the sixth season to use VAR, featuring it in all matches played. The only change in the rules is the limited number of players that can be sent on loan.

Promotion and relegation (pre-season)
A total of sixteen teams contested the league, including thirteen sides from the 2022–23 season, the winner of last season's second league, and two winners of the play-out, determined on 4 June.

After being relegated in the 2021–22 season, MFK Karviná returned to Czech First League as the champion of the 2022–23 Czech National Football League.
 * Team promoted to Czech First League

The lowest positioned team from the last season, Zbrojovka Brno, was relegated to the Czech National Football League.
 * Teams relegated from Czech First League

Managerial changes
Ahead of the season:

During the season:

Championship group
Points and goals were carried over in full from the regular season.

Conference League play-off
Teams placed between 7th and 10th position will take part in the Conference League play-off. The best of them will play against the fifth-placed of the championship play-offs to determine the Conference League play-off winners. The winners will qualify for the second qualifying round of the 2024–25 UEFA Conference League.

Relegation group
Points and goals were carried over in full from the regular season.

Relegation play-offs
Teams placed 14th and 15th in the relegation group will face the teams placed 2nd and 3rd in the Czech National Football League for two spots in the next season.

Hat-tricks
4 Player scored 4 goals (H) – Home team (A) – Away team
 * Notes