The B791 is a short link road through Renfrew, in Scotland's Central Belt. The road was originally unclassified but had gained its number by 1932.
The road starts at traffic lights on the A741 Paisley Road to the south of the town centre. It heads east along the residential Cockels Loan and soon reaches a mini-roundabout, where it turns left onto Sandy Road.
Now heading north the road runs through the housing estate. When the road was first classified Renfrew Airport lay to the right but no trace of this now exists. The road continues on and presently passes a small park, ending at a T-junction on the A8 at the far end.