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 joins the beck just north of Whaw

• William Gill drains a substantial area of West Moor into Beck Crooks, which is the first tributary after Arkle Beck's source

• Annaside Beck joins just below Beck Crooks

• Roe Beck joins at Shepherd's Lodge just above Great Punchard Gill

In 1986, a section of the meadow alongside Arkle Beck at Whaw was designated as a site of special scientific interest (SSSI).

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