Johann Günther Gensler (28 February 1803, Hamburg - 28 May 1884, Hamburg) was a German etcher, illustrator and painter; primarily of portraits. His known work consists of over 120 oil paintings and drawings.
His father was a goldsmith, who drew as a hobby. His younger brothers, lt=Jacob and, also became painters. All three would eventually become members of the, and Jacob served on the Board of Directors. They were also all members of the, a gymnastics society.
He initially studied with Gerdt Hardorff, a friend of the family. Then, around 1822, he studied with Johann Heinrich Wilhelm Tischbein. By the mid-1820s, he and Martin were teaching art history and drawing at the Gelehrtenschule des Johanneums.
According to documentary records, he was in Dresden in 1829, and travelled to Amsterdam in 1837, where he studied the works of Rembrandt and Bartholomeus van der Helst. The year 1844 found him in Rome, seeking new inspiration, which was apparently not forthcoming.
In 2019, his works were part of the exhibition, "Hamburger Schule – Das 19. Jahrhundert neu entdeckt", at the Hamburger Kunsthalle.