| Competition: | I liga |
| Season: | 1974–75 |
| Dates: | 17 August 1974 – 18 June 1975 |
| Winners: | Ruch Chorzów (12th title) |
| Relegated: | Gwardia Warsaw Arka Gdynia |
| Continentalcup1: | European Cup |
| Continentalcup1 Qualifiers: | Ruch Chorzów |
| Continentalcup2: | Cup Winners' Cup |
| Continentalcup2 Qualifiers: | Stal Rzeszów (II liga) |
| Continentalcup3: | UEFA Cup |
| Continentalcup3 Qualifiers: | Stal Mielec Śląsk Wrocław |
| Matches: | 240 |
| Total Goals: | 469 |
| League Topscorer: | Grzegorz Lato (19 goals) |
| Biggest Home Win: | Ruch 6–0 Arka |
| Biggest Away Win: | Gwardia 0–6 Legia |
| Highest Scoring: | Szombierki 5–2 ŁKS Pogoń 5–2 Szombierki |
| Highest Attendance: | 60,000[1] |
| Attendance: | 3,315,360 |
| Average Attendance: | 13,814 0.9% |
| Prevseason: | 1973–74 |
| Nextseason: | 1975–76 |
The 1974–75 I liga was the 49th season of the Polish Football Championship and the 41st season of the I liga, the top Polish professional league for association football clubs, since its establishment in 1927. The league was operated by the Polish Football Association (PZPN).
The defending champions were Ruch Chorzów, who won their 12th Polish title.
The season started on 17 August 1974 and concluded on 18 June 1975 (autumn-spring league). The season was played as a round-robin tournament. The team at the top of the standings won the league title. A total of 16 teams participated, 14 of which competed in the league during the 1973–74 season, while the remaining two were promoted from the 1973–74 II liga. Each team played a total of 30 matches, half at home and half away, two games against each other team. Teams received two points for a win and one point for a draw.
| Rank | Player | Club | Goals |
|---|---|---|---|
| 1 |  Grzegorz Lato | Stal Mielec | 19 |
| 2 | Kazimierz Kmiecik | Wisła Kraków | 15 |
| Joachim Marx | Ruch Chorzów | 15 | |
| 4 | Leszek Wolski | Pogoń Szczecin | 14 |
| 5 | Jan Domarski | Stal Mielec | 13 |
| Jerzy Radecki | Polonia Bytom | 13 | |
| Andrzej Szarmach | Górnik Zabrze | 13 | |
| Bronisław Bula | Ruch Chorzów | 13 | |
| 9 | Roman Jakóbczak | Lech Poznań | 12 |
| 10 | Zdzisław Kapka | Wisła Kraków | 11 |
| Eugeniusz Nagiel | Szombierki Bytom | 11 | |
| Władysław Dąbrowski | Legia Warsaw | 11 |