John Danaher

• John Danaher (VC), Irish recipient of the Victoria Cross
• John A. Danaher, U.S. senator and judge from Connecticut
• John A. Danaher III, grandson of the above, commissioner of the Connecticut Department of Public Safety
• John Danaher (martial artist), Brazilian jiu-jitsu and mixed martial arts instructor
• John Danaher (ethicist), Irish legal scholar and philosopher