Johan Ernst Hartmann (2 March 1770 – 16 December 1844) was a Danish organist and composer, and son of composer and violinist Johann Hartmann. In 1795 he started as an organist at Frederik's German Church in Christianshavn and in 1807 he became cantor at Roskilde Cathedral. Some of his compositions, including cantatas, were performed in the years 1789-97. At Roskilde, he established a renowned choir for which he composed various works .^[1][2][3]

This article has multiple issues. Please help improve it or discuss these issues on the talk page. (Learn how and when to remove these template messages) This article needs additional citations for verification. (October 2018) You can help expand this article with text translated from the corresponding article in Danish. (April 2009) Click [show] for important translation instructions. Machine translation, like DeepL or Google Translate, is a useful starting point for translations, but translators must revise errors as necessary and confirm that the translation is accurate, rather than simply copy-pasting machine-translated text into the English Wikipedia. Do not translate text that appears unreliable or low-quality. If possible, verify the text with references provided in the foreign-language article. You must provide copyright attribution in the edit summary accompanying your translation by providing an interlanguage link to the source of your translation. A model attribution edit summary is Content in this edit is translated from the existing Danish Wikipedia article at [[:da:Johan Ernst Hartmann]]; see its history for attribution. You may also add the template {{Translated|da|Johan Ernst Hartmann}} to the talk page. For more guidance, see Wikipedia:Translation.

He died on 16 December 1844. His son, Søren Hartmann (1815-1912) became his successor as cantor at Roskilde Cathedral, where he also stayed for 40 years until 1883.

• List of Danish composers