| Kadıoğlu Tunnel Kadıoğlu Tüneli | |
| Location: | Fatsa, Ordu Province |
| Coordinates: | 40.9958°N 37.6372°W |
| Status: | Operational |
| Startwork: | 1997 |
| Operator: | General Directorate of Highways |
| Traffic: | automotive |
| Construction: | Nurol-Tekfen-Yüksel joint venture |
| Length: | 116and |
| Lanes: | 2 x 2 |
| Speed: | 80km/h |
Kadıoğlu Tunnel (Turkish: Kadıoğlu Tüneli), is a highway tunnel constructed in Ordu Province, northern Turkey.
Kadıoğlu Tunnel is part of the Samsun-Ordu Highway within the Black Sea Coastal Highway, of which construction was carried out by the Turkish Nurol-Tekfen-Yüksel joint venture. The 116and-long twin-tube tunnel carrying two lanes of traffic in each direction. The Kozbükü Tunnel follows the Kadıoğlu Tunnel in direction Ordu.
The tunnel was opened to traffic on 7 April 2007 by Turkish Prime Minister Recep Tayyip Erdoğan. Dangerous goods carriers are not permitted to use the tunnel.
