| Box Width: | 30em |
| İzmir–Denizli Regional | |
| Type: | Regional rail |
| Status: | Operating |
| Locale: | Western Anatolia |
| First: | 2009 |
| Operator: | TCDD |
| Start: | Basmane station, İzmir |
| Stops: | 18 |
| End: | Denizli station, Denizli |
| Journeytime: | 4 hours, 07 minutes |
| Frequency: | Daily |
| Class: | Classless |
| Access: | Limited |
| Seating: | Coach seating |
| Catering: | Trolley catering facilities |
| Entertainment: | TCDD promotional video loop is displayed in the in-train entertainment system |
| Stock: | TCDD DM15000, TCDD MT30000 |
| Owners: | TCDD |
The İzmir–Nazilli Regional (tr|Basmane–Nazilli Bölgeseli), numbered as B310, is a passenger train operated by the Turkish State Railways, that runs between Basmane Terminal in İzmir to Nazilli. The train operates along the same route as the İzmir–Denizli Regional, serving a shorter portion of the line. Before regional service was extended to Denizli after track upgrades, three daily trains in each direction would operate as the İzmir–Nazilli Regional. Train service started in 2009 after the completion of the Şirinyer Tunnel.