Bad Wilsnack is a small town in the Prignitz district, in Brandenburg, Germany. The former pilgrimage site of the Holy Blood of Wilsnack has been officially recognised as a spa town (Bad) since 1929. It is the administrative seat of the Amt Bad Wilsnack/Weisen.

The Holy Blood of Wilsnack was the name given to three hosts, which survived a fire in 1383 that burned the church and village to the ground. The hosts were thus seen as miraculous. The relics became the destination of medieval religious pilgrimages to Bad Wilsnack, Germany for nearly two centuries. Revenue from the many pilgrims enabled the town to build the large St. Nicholas' Church at the site. The hosts were destroyed by reformers in 1558 during the Protestant Reformation.