Marcus Wallenberg (June 1774 – 22 September 1833) was a Swedish theologian who served as the Bishop of Linköping between 1819 and 1833.

Wallenberg studied at Uppsala University from 1790, was promoted to master of philosophy in 1797, and obtained a bachelor's degree in juris utriusque in the same year.

[1] He became a docent in Roman eloquence from 1800, but was forced to leave Uppsala the same year after the so-called music trial and moved to Lund.

In 1802 he became a consistory notary in Linköping and in 1805 a lecturer in Greek at the high school there.

[1] He was ordained a priest in 1817, promoted to doctor of theology in 1818 in connection with Charles XIV John's ascension to the throne, and between 1819 and 1833 was bishop in the diocese of Linköping.