| Competition: | I liga |
| Season: | 1969–70 |
| Dates: | 9 August 1969 – 21 June 1970 |
| Winners: | Legia Warsaw (4th title) |
| Relegated: | Odra Opole Cracovia |
| Continentalcup1: | European Cup |
| Continentalcup1 Qualifiers: | Legia Warsaw |
| Continentalcup2: | Cup Winners' Cup |
| Continentalcup2 Qualifiers: | Górnik Zabrze |
| Continentalcup3: | Inter-Cities Fairs Cup |
| Continentalcup3 Qualifiers: | Ruch Chorzów GKS Katowice |
| Matches: | 182 |
| Total Goals: | 382 |
| League Topscorer: | Andrzej Jarosik (18 goals) |
| Biggest Home Win: | Zagłębie S. 6–1 Pogoń Stal 6–1 Odra Ruch 5–0 Wisła |
| Biggest Away Win: | Zagłębie W. 0–4 GKS Odra 0–4 Legia |
| Highest Attendance: | 40,000[1] [2] |
| Attendance: | 1,854,944 |
| Average Attendance: | 10,192 |
| Prevseason: | 1968–69 |
| Nextseason: | 1970–71 |
The 1969–70 I liga was the 44th season of the Polish Football Championship and the 36th 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 Legia Warsaw, who won their 4th Polish title.
The season started on 9 August 1969 and concluded on 21 June 1970 (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 14 teams participated, 12 of which competed in the league during the 1968–69 season, while the remaining two were promoted from the 1968–69 II liga. Each team played a total of 26 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 |  Andrzej Jarosik | Zagłębie Sosnowiec | 18 |
| 2 | Robert Gadocha | Legia Warsaw | 12 |
| Włodzimierz Lubański | Górnik Zabrze | 12 | |
| Jan Pieszko | Legia Warsaw | 12 | |
| 5 | Ryszard Szymczak | Gwardia Warsaw | 11 |
| 6 | Jerzy Wilim | Szombierki Bytom | 10 |
| Jan Domarski | Stal Rzeszów | 10 | |
| Edward Herman | Ruch Chorzów | 10 | |
| 9 | Bronisław Bula | Ruch Chorzów | 9 |
| 10 | Joachim Marx | Ruch Chorzów | 8 |
| Eugeniusz Faber | Ruch Chorzów | 8 |