Flota Swinoujscie and Gwardia Koszalin fans clashed during their Polish fifth division match on Sunday.
Ruch Chorzow fans clashed with stadium security during their Polish Cup tie against rivals Gornik Zabrze on Thursday.
Barycz Sulow and Polonia-Stal Swidnica fans clashed on the pitch during their Polish IV Liga match on Saturday.
Tarnovia fans were attacked by a group of Unia Tarnow hooligans armed with clubs at a match on Saturday.
Fighting broke out between rival fans at a Polish third division match between Ruch Chorzow and Motor Lublin on Friday.
On this day in 2014, Legia and Jagiellonia fans clashed in the stands at the Polish Army Stadium during their Ekstraklasa match.
Widzew Lodz’s Polish cup match against Slask Wroclaw was stopped for several minutes on Tuesday after trouble broke out in the away end.
A brawl broke out between Wloclavia Wloclawek and Legia Chelmza fans during their Polish IV Liga match on Sunday.
A Polish IV Liga match between Karpaty Krosno and JKS Jaroslaw was abandoned on Sunday following a pitch invasion by home fans.
A Polish lower-league match between Okocimski Brzesko and Tarnovia Tarnow was abandoned on Saturday after rival fans clashed on the pitch.
A Polish Cup match between Wisla Sandomierz and Korona Kielce was halted on Wednesday after a pitch invasion.
A brawl broke out between rival fans before a Polish lower-division match on Sunday.