2016–17 Ekstraklasa
The 2016–17 Ekstraklasa was the 83rd season of the Ekstraklasa, the top Polish professional league for association football clubs, since its establishment in 1927. The league is operated by the Ekstraklasa SA.
The season started on 15 July 2016, running to 4 June 2017. After the 20th matchday the league was on winter break between 20 December 2016 and 9 February 2017. The regular season was played in a round-robin tournament. A total of 16 teams participated, 14 of which competed in the league during the 2015–16 season, while the remaining two were promoted from the I liga. The fixtures were announced on 1 June 2016.
Each team played a total of 30 matches, half at home and half away. After 30th round, league was split into two groups: championship round and relegation round. Each team was play 7 more games, starting with half the points achieved during the first phase of 30 matches. So, finally each team played a total of 37 matches. This is the fourth season to take place since the new playoff/playout rule has been introduced.
The defending champions were Legia Warsaw, who won their 11th Polish title the previous season.
Teams
Sixteen teams competed in the league – the top fourteen teams from the previous season, as well as two teams promoted from the I liga. Arka Gdynia became the first team to be promoted. They return to the league after a five-season absence. Wisła Płock returns to the top level nine years after their relegation. Termalica Bruk-Bet Nieciecza changed its name to Bruk-Bet Termalica Nieciecza.Stadiums
| Team | Location | Venue | Capacity |
| Arka Gdynia | Gdynia | Stadion Miejski | 15,139 |
| Bruk-Bet Termalica Nieciecza | Nieciecza | Stadion Bruk-Bet Termaliki | 4,666 |
| Cracovia | Kraków | Stadion Cracovii | 15,016 |
| Górnik Łęczna | Lublin | Arena Lublin | 15,500 |
| Jagiellonia Białystok | Białystok | Stadion Miejski | 22,432 |
| Korona Kielce | Kielce | Kolporter Arena | 15,550 |
| Lech Poznań | Poznań | INEA Stadion | 43,269 |
| Lechia Gdańsk | Gdańsk | Stadion Energa Gdańsk | 43,615 |
| Legia Warsaw | Warsaw | Stadion im. Marszałka Józefa Piłsudskiego | 31,800 |
| Piast Gliwice | Gliwice | Stadion Miejski | 10,037 |
| Pogoń Szczecin | Szczecin | Stadion im. Floriana Krygiera | 18,027 |
| Ruch Chorzów | Chorzów | Stadion Miejski | 9,300 |
| Śląsk Wrocław | Wrocław | Stadion Miejski | 42,771 |
| Wisła Kraków | Kraków | Stadion im. Henryka Reymana | 33,326 |
| Wisła Płock | Płock | Stadion im. Kazimierza Górskiego | 12,800 |
| Zagłębie Lubin | Lubin | Stadion Zagłębia | 16,068 |