|Distance:||3.1 miles (5 km)|
|Route outline (key)|
The B4575 is a short route in the valley of the River Ystwyth in north Cardiganshire. The road was originally unclassified but gained its number in 1935.
Starting at a mini-roundabout by the Falcon Inn on the A485 in the village of Llanilar, the road follows the river upstream to Trawsgoed (Crosswood), where it TOTSOs left to cross the Ystwyth and terminate immediately at a T-junction with the B4340.