Johann Wilhelm Weinmann (1683–1741) was a German apothecary and botanist best known for creating the florilegium Phytanthoza iconographia between 1737 and 1745. Born in Gardelegen, he settled in Regensburg as an apothecary, where his flourishing business allowed him to pursue his botanical interests. Weinmann established a botanical garden and published several works on medicinal plants.
His Phytanthoza iconographia is an ambitious illustrated botanical series consisting of eight folio volumes with over 1,000 hand-colored engravings of thousands of plants. This work employed notable illustrators such as Georg Dionysius Ehret and used innovative mezzotint printing techniques. The florilegium is highly regarded for its artistic quality and accuracy and influenced botanical illustration significantly.