Winsum (Dutch: [ˈʋɪnsʏm] ⓘ; Gronings: Wìnzum [ˈʋɪ̃ːzəm]) is a town and a former municipality in the northeastern Netherlands.

The majority of the town's 8,000 inhabitants commute to the nearby city Groningen.

The town boasts two traditional Dutch wind mills, two historic churches, two canals, and one of the Netherlands' oldest taverns.

Winsum is twinned with [3] Winsum hosted the start and finish of stage 4a during the 2012 Energiewacht Tour and the individual time trial (stage 3a) at the 2013 Energiewacht Tour.

Due to the success of the 2012 Energiewacht Tour the city became host city for the men's and women's 2013 Dutch National Time Trial Championships on 19 June 2013.