Gessler or Geßler may refer to:
- People with that surname
- Albrecht Gessler, 14th century Austrian bailiff connected with the William Tell legend
- Amaka Gessler, New Zealand swimmer
- Friedrich Leopold von Geßler (1688-1762), Prussian field marshal
- Doc Gessler (1880-1924), American baseball player
- Otto Gessler (1875-1955), German politician
- Scott Gessler (born 1965), American lawyer and Secretary of State of the U.S. State of Colorado
- Other uses
- 113355 Gessler, asteroid
- Gessler Clinic, P.A., a large outpatient clinic system in Winter Haven, Florida