This article is about the current B880 on the Isle of Arran.
For the former B880 on the Isle of Bute, see B880 (Bute)
The B880 bisects Arran from the island capital of Brodick on the east coast to Blackwaterfoot on the west coast. For much of its life it has met the A841 at each end, but with that routes curtailment it now stops on an unclassified road just short of Blackwaterfoot itself.
This route was originally numbered as the A842. However, there was a review of the road numbers on Arran during the 1920s and by 1932 the route had been renumbered as the B880, which it remains to this day.