was created in 1945, owned by the Citizen's Militia. As a result of this the club was seen as being a "Gwardian" establishment which left the club poorly supported with fans choosing to follow either Lech Poznań or Warta Poznań. During the 1980s the club was a regular in the Ekstraklasa, however after the fall of communism in Poland in 1989 Olimpia lost a lot of its funding and fell into obscurity.
Lechia Gdańsk
were also created in 1945, Lechia's greatest success in the top flight came during the 1950s, when the club finished 3rd during the 1956 season. After spending the 1960s and 70's in the lower divisions, Lechia won the Polish Cup and the Polish SuperCup in 1983. After a spell back in the top flight, Lechia soon found themselves playing in the lower divisions once more.
Olimpia-Lechia Gdańsk
Many Lechia fans were unhappy with the merger, and wished to play solely under the Lechia Gdańsk name. However they hoped that if the Olimpia-Lechia Gdańsk team stayed in the top flight, they would drop Olimpia from the merger and once again become Lechia Gdańsk. Olimpia-Lechia started the season well, getting 10 points from their opening 4 games. The season which started so well for Olimpia-Lechia soon started to turn negative. In the 5thgame of the season GKS Katowice turned up to the Olimpia Poznań facility in Poznań (which wasn't being used Olimpia-Lechia for that season. As a result, Katowice were awarded the win despite the teams not playing a game. The team's fortunes got worse after this game and they started falling downthe league table. By the time the season had come to the winter break, Olimpia-Lechia found themselves in the relegation zone. After the winter break Olimpia-Lechia's fortunes did not improve, and the team ended up finishing 16th and 2 points from safety. After the season Lechia fans' original wishes came to pass. Olimpia left the merger, meaning that the original Lechia Gdańsk team who continued to play in the third tier for the 1995–96 season took the relegated Olimpia-Lechia team's place in the second division, with the team being renamed back to Lechia Gdańsk.
After the merger with Lechia, Olimpia's fortunes never returned to their glory days. The team continued to struggle and found themselves playing in the lowest tiers of Polish football. The team found it hard to gain fan support and much needed investment after neglect from their owners and eventually the football section of the club was dissolved in 2005. Lechia also continued to struggle after the merger, eventually having to merge again with another team, Polonia Gdańsk, this time creating Lechia-Polonia Gdańsk. This new merger broke off in 2001, sending both teams to the lowest tier of Polish football. After having to start from the bottom, Lechia's fortunes changed and they found themselves playing in the Ekstraklasa once again for the 2008/09 season. After 11 seasons of continuous top flight football Lechia won both the Polish Cup and the Polish SuperCup in 2019, leading to the team playing European football for only the second time in their history.