The B2177 is a B road in Hampshire, England a constituent country of the United Kingdom. It starts at the traffic light junction with the B2150 north and the B2150 east in Bedhampton () and continues to the roundabout where a right turn takes the driver up onto the slopes of Portsdown Hill. It shortly crosses the A3(M) by a high road bridge and continues for some distance westwards on a mainly straight road past several Napoleonic era forts before turning north west, skirting the village of Southwick going through North Boarhunt before reaching Wickham. Passing through the town the road heads north through Waltham Chase until it reaches Bishop's Waltham. The route then heads north west through Lower Upham, past Marwell Wildlife before arriving at the roads end, the junction with the B3354 at Fisher's Pond ().
The section from the Portsdown Hill roundabout to Fisher's Pond (Colden Common) was formerly part of the A333 Winchester to Portsmouth Road. This continued south from Portsdown roundabout to the A3 at Cosham, and north from Fisher's Pond through Twyford to the Hockley traffic lights (a notorious bottleneck on the A33 Winchester by-pass) and across the Itchen Water Meadows (route now mainly pedestrianised) to St Cross.[1]