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.
Players
First-team squad
Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply. Players may hold more than one non-FIFA nationality.
* Also holds German citizenship.
** Also holds Australian citizenship.
Transfers
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Transfers in
Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply. Players may hold more than one non-FIFA nationality.
Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply. Players may hold more than one non-FIFA nationality.
Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply. Players may hold more than one non-FIFA nationality.
^2008–09 Turkish Cup was won by Champions League-qualified side Beşiktaş. Since cup runners-up Fenerbahçe secured a place in the European competitions via league position, the spot allocation for the 2009–10 UEFA Europa League effectively reverted to league positions.
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.
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