Heinrich Lossow (10 March 1843 in Munich, Kingdom of Bavaria – 19 May 1897 in Schleissheim, Austria-Hungary) was a German genre painter and illustrator. He was a prolific pornographer in his spare time.
Heinrich Lossow's father was Arnold Hermann Lossow, a Bremen sculptor. His father moved to Munich in 1820 to study under Ernst Mayer. In Munich, Arnold Hermann Lossow married and had three children: Carl Lossow in 1835, Friedrich Lossow in 1837, and Heinrich Lossow in 1843. The three boys had an affinity for art; Carl became a historical painter, while Friedrich became a wildlife painter. Heinrich would outlive all of his siblings.
Later in his life, he served as a curator at the Schleissheim Palace.