Barbara Regina Dietzsch (22 September 1706 – 1 May 1783) was a Bavarian painter and engraver known for her still lifes.

Dietzsch specialized in watercolor and gouache paintings of animals and plants. She primarily painted flowers, and she also painted birds and shells. Her works are typically identifiable by their brown or otherwise monochromatic backgrounds. These works were made into engravings, most of which Dietzsch created herself.