Karin Olofsdotter Bång, also known as Bång-Karin (1720–1790), was a Swedish spiritual ecstatic leader.
Karin Olofsdotter was married to the farmer Johan Olofsson (1724–1794) at the farm Bångas in Nordanhån.
In 1768, Karin started to appear with fits of ecstatic convulsions and glossolalia, during which she held sermons against vices and warned of a coming apocalypse.
With the support of Thunberg, Karin gathered her own congregation of followers who studied the Bible and engaged themselves in their own ecstatic fits and visions together.
In 1771, Thunberg was trialed, fined, deposed from his post as a priest and eventually placed in the Danviken Hospital.