| Sakarya Viaduct | |
| Native Name: | Sakarya Viyadüğü |
| Native Name Lang: | tr |
| Coordinates: | 39.3615°N 31.5807°W |
| Carries: | 2 tracks of the Ankara-Istanbul high-speed railway |
| Crosses: | Sakarya River |
| Locale: | near Polatlı, Ankara Province |
| Named For: | Sakarya river |
| Owner: | Turkish State Railways |
| Length: | 2233m (7,326feet) |
| Height: | 16m (52feet) |
| Begin: | 2007 |
| Complete: | 2008 |
| Inaugurated: | 13 March 2009 |
| Traffic: | 28 scheduled trains daily[1] |
The Sakarya Viaduct (Turkish: Sakarya Viyadüğü) is a 2233m (7,326feet) long railway bridge carrying the Ankara-Istanbul high-speed railway across the Sakarya River and its adjacent plain approximately 15km (09miles) west of Polatlı, Turkey. The bridge is the third longest bridge in Turkey after the Osman Gazi Bridge and the Mount Bolu Viaducts as well as the longest railway bridge in the country.
Construction of the viaduct was started in 2007 and completed in 13 months.[2] The bridge entered revenue service on 13 March 2009, with the opening of the railway from Ankara to Eskişehir.