Karin Johansdotter (died after 1605), was a Swedish Roman Catholic nun of the Bridgettine Order. She was the last nun in Sweden after the Swedish Reformation. Karin Johansdotter joined the Vadstena Abbey at an unknown year. She was still of childbearing age in 1605, and is thus likely to have joined the Vadstena Abbey during the reign of John III of Sweden or Sigismund III Wasa, when Sweden leaned toward a counter-reformation, and the Abbey was allowed to receive novices again: the last novice was accepted to the Abbey as late as 1593.