Arkle Beck is the stream running through the valley of Arkengarthdale in the Yorkshire Dales, England. It is a tributary of the River Swale, which it joins just past Reeth at Grinton Bridge. The beck itself has several tributaries which include:
- Great Punchard Gill
- William's Gill
- Annaside Beck
- Roe Beck
In 1986, a section of the meadow alongside Arkle Beck at Whaw was designated as a site of special scientific interest (SSSI).
Coordinates: 54°22′57″N 1°56′05″W / 54.3824°N 1.9347°W