Gessler or Geßler is a German surname. Notable people with the surname include:
Albrecht Gessler, 14th century Austrian bailiff connected with the William Tell legendAmaka Gessler (born 1990), New Zealand swimmerFriedrich Leopold von Geßler (1688–1762), Prussian field marshalDoc Gessler (1880–1924), American baseball playerOtto Gessler (1875–1955), German politicianScott Gessler (born 1965), American lawyer and Secretary of State of the U.S. State of Colorado