Carl Gustaf Hjalmar Mörner was a Swedish count, officer, draftsman, painter, etcher and lithographer.

Mörner came from the Swedish branch of the German noble family Mörner. He was the son of Count Gustaf Fredrik Mörner (October 11, 1768 to January 19, 1841) and Baroness Augusta Lovisa (née von Höpken), his great-grandmother was Ulla von Fersen. He was a nephew of Axel Otto Graf Mörner. Mörner first embarked on a military career and in 1810 became a cornet with the "Smålands lätta dragoons" (Småland light dragoons) and took part in the battles in Großbeeren, Dennewitz, Leipzig and Bornhöft. In 1823 he was appointed knight master and took his leave.

He began training as a painter (mostly as an autodidact ) and traveled to Italy from 1816 to 1828, where he studied and worked in Rome from 1825 to 1828 on a scholarship abroad. He lived in London from 1830 to 1836 before settling in Paris.

He died there unmarried in 1837 and was buried in the Père Lachaise cemetery. Mörner preferably painted genre paintings and folk scenes.