| Adapazarı | |
| Style: | TCDD |
| Address: | Gar meydanı, 54100 Semerciler, Sakarya |
| Country: | Turkey |
| Platform: | 4 |
| Tracks: | 6 |
| Parking: | Located next to the station's plaza |
| Opened: | 1899 |
| Closed: | 2012-13, 12 December 2016 |
| Rebuilt: | 1969 |
| Electrified: | 1969 |
| Owned: | Turkish State Railways |
| Other Services Header: | Former services |
| Other Services Collapsible: | yes |
Adapazarı station is the main terminal railway station in the city of Adapazarı. It is the eastern terminus of the Haydarpaşa-Adapazarı Regional, the most heavily used rail service line in Turkey and second most in service frequency. The station is located directly in the city center. The other two stations serving Adapazarı are Mithatpaşa railway station, located in southwestern Adapazarı and Arifye railway station, located in Adapazarı's southern suburb. The station is situated on the north end of the Adapazarı Branch, which connects to the Istanbul––Ankara Main Line at Arifye.
The station was opened on November, 1899 by the Anatolian Railway (CFOA). The railway intended to continue to the railway to Bolu and then Ankara, but this never happened and the station became a terminal. In 1969, the line was electrified and new improved regional service was added to Istanbul. On February 1, 2012, the station temporarily closed down due to the construction of the Ankara–Istanbul high-speed railway, however a project that if approved will lead to the abandonment of the station in favor of building a new station in Arifye, which is 8.13km (05.05miles) southwest of the city center.
The station is used for storing rail cars, but currently it's the main station for Ada Express since 2019.[1]