Wilhelm Vischer (5 January 1890 in Basel – 2 June 1960 in Basel) was a Swiss botanist whose areas of interest were algae and spermatophytes. He studied medicine in Geneva and Basel, and natural sciences in Munich, where in 1914 he obtained his PhD. At the University of Munich, he was a student of Karl Ritter von Goebel. Following graduation, with Robert Hippolyte Chodat, he participated in a botanical excursion to Paraguay. After his return to Switzerland, he spent several years in Geneva (1914–1919), working on plants that were collected in Paraguay.