|Length:||3.2 miles (5.1 km)|
|Route outline (key)|
The B3146 is a short B-road in central Dorset.
It starts to the south of Holnest by turning east off the A352. It turns more southerly before going through the largest village on the route (although still a small place), namely Glanvilles Wootton. After going round a number of sharp bends the road terminates at a T-junction on the B3143.