National Highway 166 (NH 166) is a National Highway in India.

It runs from Ratnagiri to Solapur via Kolhapur, Sangli, Miraj, Solapur in Maharashtra.

This is a main link connecting Konkan region to South-Western region in Maharashtra.

The complete highway is built of rigid pavement with paved shoulders on both sides.

Ratnagiri - Kolhapur - Sangli - Miraj - Solapur [1][2] [1][2]