De Hoop (English: The Hope) is a smock mill in Sumar, Friesland, Netherlands which was built in 1867 and is in working order.

In that year, a corn and pearl barley mill built on this site for Geert Hammens de Jong of Hurdegaryp, Friesland.

The mill changed hands a number of times, and was in the ownership of Jouke Hedzers Looijenga of Garyp, Friesland.

The miller's house and surviving base were purchased at auction by Jacob Jans Formsma for ƒ2,250.

The mill was sold by auction on 21 March 1882 to Jacob Jans Formsma and was removed from Kootstertille between 8–10 April.

[5] Restorations were carried out in 1965-66 by Fabrikaat Medendorp of Zuidlaren, Drenthe and in 1992-93 by Bouwbedrijf Kolthof of Stiens, Friesland.

The sails are carried on a cast-iron windshaft, which was cast by the IJzergieterij De Prins van Oranje, The Hague, South Holland in 1874.

The great spur wheel drives a pair of 1.60 metres (5 ft 3 in) diameter Cullen millstones via a lantern pinion stone nut which has 22 staves and a second pair of 1.60 metres (5 ft 3 in) diameter Cullen millstones via a lantern pinion stone nut which has 23 staves.