Dr. Jonas Gustav Vilhelm Zander (29 March 1835 in Stockholm – 17 June 1920) was a Swedish physician, orthopedist and one of the originators of mechanotherapy.

He is known for inventing a therapeutic method of exercise carried out by means of a special apparatus.

In 1880 he became a lecturer of the Stockholm University, and in 1896 he became a member of the Royal Swedish Academy of Sciences.

In the 1970s Arthur Jones, invented machines known as Nautilus to aid with High Intensity Training .

Nautilus workout machines proved to be very similar to Gustav Zander's exercising machines which were widespread in America in the early 20th century, but Jones insists that he made these discoveries without any knowledge of Zander's discoveries: