John Danaher

John Danaher may refer to:
 * John Danaher (VC) (1860–1919), Irish recipient of the Victoria Cross
 * John A. Danaher (1899–1990), U.S. senator and judge from Connecticut
 * John A. Danaher III (born 1950), grandson of the above, commissioner of the Connecticut Department of Public Safety
 * John Danaher (martial artist) (born 1967), Brazilian jiu-jitsu and mixed martial arts instructor