The 2009–2010 season was the 106th year of Beşiktaş' existence, as well as its 50th season in the Süper Lig. The club also competed in the Turkish Cup and UEFA Champions League. Beşiktaş entered the season as the defending champion of the both the Süper Lig and Turkish Cup. During the pre-season, the club also participated in the Peace Cup, finishing second in their group behind Porto and ahead of Lyon.

The first transfer of the January window was goalkeeper Ramazan Özcan.

The new season kits of Beşiktaş were introduced on 19 July on the season jersey and fall/winter fashion clothing show at Nevzat Demir Facilities. The kit supplier of jerseys is Adidas and the main jersey sponsor is Cola Turka for the season, as it is since 2004.

According to official club website as of 31 July 2009:

Updated to games played on 15 May 2010.
Source: Süper Lig official website
Rules for classification: 1stoverall points, 2nd head-to-head points, 3rd head to head goal differential, 4th overall goal differential, 5thoverall goals scored.
¹via Turkish Cup.
²On 7 October 2009, the Turkish Football Federation relegated Ankaraspor to the TFF First League with immediate effect due to the relationship of its governors with those of Ankaragücü being unsuitable for two teams competing in the same division. All of Ankaraspor's matches have been scratched and will be counted as a 3–0 win for their opponents.
(C) = Champion; (R) = Relegated; (P) = Promoted; (E) = Eliminated; (O) = Play-off winner; (A) = Advances to a further round.
Only applicable when the season is not finished:
(Q) = Qualified to the phase of tournament indicated; (TQ) = Qualified to tournament, but not yet to the particular phase indicated; (RQ) = Qualified to the relegation tournament indicated; (DQ) = Disqualified from tournament.

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Wikipedia