2005–06 TFF First League

The 2005–06 Turkish Second League Category A (also known as Iddaa League A due to sponsoring reasons) was the second-level football league of Turkey and the 43rd season since its establishment in 1963–64. At the end of the season, in which 18 teams competed in a single group, Bursaspor and Antalyaspor, which finished the league in the first two places, and the play-off winner Sakaryaspor were promoted to the upper league, while Mersin İdman Yurdu, Yozgatspor and Çanakkale Dardanelspor, which were in the last three places, were relegated.

Promotion play-offs
Promotion play-offs were organized in 19 Mayıs Stadium in Ankara between May 20 and May 24