Bishop Johannes Rudbeckius or Johannes Rudbeck (3 April 1581 – 8 August 1646) was bishop at Västerås, Sweden from 1619 until his death and personal chaplain to King Gustavus II Adolphus.

[1] Being a member of the Rudbeck family, Johannes was born in Ormesta, Almby parish, outside Örebro, Sweden.

Rudbeckius was considered politically suspect by his superiors but his reforms were gradually introduced in the whole country.

[2][3] With his second wife Magadalena Malin Carlsdotter (1602–1649), he had a son Olaus Rudbeck (1630–1702), who was a noted scientist of the 17th century.

Bishop Rudbeckius' granddaughter, Wendela Rudbeck (1668–1710), married Peter Olai Nobelius (1655–1707) from whom descended Alfred Nobel (1833–1896).