2008–09 Beşiktaş J.K. season

The 2008–09 season was Beşiktaş' 105th football season. Also it was the 50th year of the Süper Lig. Beşiktaş won the domestic double of the league title and cup.

First-team squad
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* Also holds 🇩🇪 German citizenship. ** Also holds 🇦🇺 Australian citizenship.

Turkish Cup
After finishing in the top four of the previous season's Süper Lig, Beşiktaş qualified for the group stages. Beşiktaş was placed in Group A, along with Antalyaspor, Gaziantepspor, Trabzonspor and Gaziantep B.B. Beşiktaş finished first.

Quarter-finals
Beşiktaş won 5-1 on aggregate

Semi-finals
Beşiktaş won 4-3 on aggregate

UEFA Cup
After finishing third in the previous season's Süper Lig, Beşiktaş qualified for the 2008–09 UEFA Cup, but was eliminated in the first round.

Second qualifying round
Beşiktaş won 6-1 on aggregate

First round
Beşiktaş lost 2–4 on aggregate