Unthank is a hamlet in the North East Derbyshire district of Derbyshire, England. It is sited on a narrow lane on the southern slopes of the Cordwell Valley, at an altitude of about .
On 6 May 1970, a USAF McDonnell-Douglas RF-4C crashed in the nearby Stripes Wood while doing a NATO training exercise. Both crew men ejected and landed at Curbar Edge.