Turkish Cup 2008–09 (Turkish: Türkiye Kupası) was the 47th season of Turkey's annual cup competition. It was also known as Fortis Türkiye Kupası due to a sponsorship contract. The winners (Beşiktaş) qualified for the play-off round of the UEFA Europa League. Kayserispor were the defending champions. Beşiktaş won the cup, after winning 4–2 against Fenerbahçe in the final match, and completed the double as they also were the champions of 2008–09 Süper Lig.

The draw for the First Round was conducted at the headquarters of the TFF in İstanbul on 22 August 2008. The games were played on 3 and 4 September 2008.

The draw for the Second Round was conducted at the headquarters of the TFF in İstanbul on 12 September 2008. The games were played on 24 and 25 September 2008.

The group stage consisted of four groups with five teams each. The four teams that finished first through fourth in Süper Lig 2007-08 were seeded as group heads: Galatasaray, Fenerbahçe, Beşiktaş and Sivasspor. The sixteen teams qualified through the first two rounds of elimination matches were randomly drawn into one of the four groups.

Every team played every other team of its group once, either home or away. The winners and runners-up of each group qualified for the quarterfinals. The games were played from 29 October 2008 to 18 January 2009.

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