Galatasaray became the Turkish league champion for a record 21st time on Saturday after defeating Izmir's Göztepe 1-0 in its final game of the season thanks to French striker Bafetimbi Gomis' second-half penalty.
The victory sealed a triumphant return to the club for veteran coach Fatih Terim, who took the reins for the fourth time last December, months after leaving his job as Turkey coach amid controversy over a street brawl.
Gomis, who has spearheaded Galatasaray's attack, took his season's goal tally to 29 with his 66th minute spot-kick, making him the top goal scorer of the season. He also broke the record of former Fenerbahçe player Alex de Souza as the highest-scoring foreign player in the Turkish league.
Fans of Galatasaray drove through the streets of Istanbul and Ankara, honking car horns and waving flags in the clubs red-and-yellow colors, while others set off fireworks and flares.
Galatasaray's nearest challengers, Fenerbahçe and Başakşehir, both three points adrift, each won their final matches 3-2.
Istanbul's other major club, Beşiktaş, won the title in each of the last two seasons.
Galatasaray, who also won the UEFA Cup in 2000, last won the domestic title in 2015. They are now two titles ahead of Fenerbahçe, who won it most recently in 2014.