Karl Borsch (born August 1, 1959 in Krefeld-Hüls) is auxiliary bishop of Aachen.
Born in Krefeld, he grew up in Kempen, where he also attended the gymnasium Thomaeum, where he graduated with abitur. From 1979-1985 he studied law in Bonn. From 1985-1990 he studied theology at the Philosophisch-Theologische Hochschule Sankt Georgen (Frankfurt) and in Freiburg.
On September 26, 1992 he was ordained a priest in Aachen, and worked as a chaplain in Hückelhoven until September 1996. From October 1, 1996 until March 31, 2002 he worked as the chaplain of the bishop and secretary. From October 2002 until March 2004 he was also director of the Collegium Leoninum seminary in Bonn.
On November 21, 2003 he was appointed auxiliary bishop of Aachen and titular bishop of Crepedula. He was consecrated on January 17, 2004 by Heinrich Mussinghoff in the Aachen Cathedral.