| Competition: | Turkish Second League Category A |
| Season: | 2004–05 |
| Winners: | Sivasspor |
| Promoted: | Sivasspor, Manisaspor, Kayseri Erciyesspor |
| Relegated: | Sarıyer, Adanaspor, Fatih Karagümrük |
| League Topscorer: | Okan Yılmaz (25) |
| Matches: | 306 |
| Total Goals: | 827 |
| Prevseason: | 2003–04 |
| Nextseason: | 2005–06 |
The 2004–05 Turkish Second League Category A was the second-level football league of Turkey and the 42nd season since its establishment in 1963–64. At the end of the season in which 18 teams competed in a single group, Sivasspor, Manisaspor and Kayseri Erciyesspor, which finished the league in the first three places, were promoted to the upper league, while Sarıyer, Adanaspor and Fatih Karagümrük, which were in the last three places, were relegated.[1]
| Rank | Player | Club | Goals | |
|---|---|---|---|---|
| 1 |  Okan Yılmaz | Bursaspor | 25 | |
| 2 | Taner Demirbaş | Kayseri Erciyesspor | 22 | |
| 3 | Mohamed Ali Kurtuluş | Sivasspor | 20 | |
| 4 | Engin Öztonga | Kocaelispor | 16 | |
| Mehmet Şen | Çanakkale Dardanelspor | 16 | ||
| Taner Gülleri | Antalyaspor | 16 | ||
| 7 | Erol Kapusuz | Kayseri Erciyesspor | 13 | |
| Mehmet Yıldız | Sivasspor | 13 | ||
| Ümit Ozan Kazmaz | Adanaspor | 13 | ||
| 10 | Hasan Kabze | Çanakkale Dardanelspor | 12 |