August Jernberg(16 September 1826 - 22 June 1896) was a Swedish artist who emigrated to Germany.
In his early years he mainly painted portraits, and historical or biblical pictures. In the 1860s he became a genre and landscape painter. He studied at the Royal Swedish Academy of Arts in Stockholm 1843-1846 and then went to Paris, where he studied under Thomas Couture from 1847 to 1853. In 1854 he settled down in Desseldorf, and remained there until his death, with the exceptions of some shorter trips.
Also his son Olof Jernberg (1855 - 1935) was an artist.