Their biggest rivals are Arka Gdynia, the games between the two are known as the "Tricity derby" (). The two teams are the largest in the Tricity area, with Lechia representing Gdańsk and Arka representing Gdynia, these are the two largest cities in the Tricity area. The Tricity derby impacts the Pomeranian region as a whole as fans of the smaller clubs in the region will also sympathise with either Arka or Lechia, with some counties being fully behind one of the teams with other counties being split between the two. Lechia receives the greatest support outside of Gdańsk from Słupsk, Starogard Gdański, Chojnice, Malbork, Sopot, and Lębork. Arka receives most of its support outside of Gdynia from Tczew, Wejherowo, Rumia, and Kościerzyna. Lechia has the most success in the derby winning 16 to Arka's 11, with Lechia also being undefeated to Arka in the Ekstraklasa (10 wins, 4 draws).