Arkengarthdale is a dale, or valley, on the east side of the Pennines in North Yorkshire, England. Running roughly north-west to south-east, it is the valley of the Arkle Beck, and is the northernmost of the Yorkshire Dales. It is a subsidiary dale to Swaledale, which it joins at Reeth. The history of the dale, its people, and farming, lead mining, and local crafts is displayed and documented in the Swaledale Museum in Reeth.