A 0-0 draw at home to Caykur Rizespor ensured a 19th Turkish title for the club and a first under head coach Ersun Yanal
The runaway leaders had the chance to seal the title last week against rivals Besiktas, but a 1-1 draw ensured they would have to put their celebrations on ice.
However, their triumph has now been secured after a 0-0 stalemate at Sukru Saracoglu stadium, ensuring a 19th Turkish title for the club and a first for head coach Ersun Yanal.
City rivals Galatasaray had dominated the Super Lig for the last two seasons, but have fallen away this term thanks to some poor early-season form, which eventually led to a chance in coaching.
Roberto Mancini's men suffered a shock 4-0 loss at home to Kasimpasa to leave Yanal's men on the brink of glory, with the draw against Besiktas only delaying their celebrations by a week.
Besiktas themselves are third in the standings, a point behind Galatasaray.