Karl Joseph Simrock (28 August 1802 – 18 July 1876) was a German poet and writer.
Simrock established his reputation by his excellent modern rendering of Das Nibelungenlied (1827), and of the poems of Walther von der Vogelweide (1833).
Before the publication of this work he had shown an original poetical faculty in Wieland der Schmied (1835); and in 1844 he issued a volume of Gedichte in which there are many good lyrics, romances and ballads.
In 1850 appeared Lauda Sion, and in 1857 the Deutsche Sionsharfe, collections of Old German sacred poetry.
The large number of editions through which Simrock's translations from the Middle High German have passed (more than 53 of Das Nibelungenlied) bear witness to their popularity.