Gustav Anders Hemwall (October 24, 1908 – November 22, 1998) was a physician at West Suburban Hospital in Oak Park, Illinois, and pioneer in prolotherapy.

[1][2][3] He was born on October 24, 1908, in Chicago, Illinois, to the Swedish immigrants Anders Hemwall I (1877–1956) and Sigrid S. Lawson (1877–1957).

[5] In 1955, at an American Medical Association meeting he learned of a new treatment for chronic lower back pain by George S. Hackett called prolotherapy.

Hemwall founded the Hackett Foundation in 1969 to promote prolotherapy and train physicians in the procedure.

[6] He died in 1998 of a stroke at St. Mary's Hospital in Madison, Wisconsin, where he had been attending a medical conference.