John Hennessey

• Hennessey (disambiguation)
• Jackie Hennessy
• John A. Hennessy
• John David Hennessey
• John F. Hennessey
• John Hennessey (rugby league)
• John Hennessy (American football)
• John Hennessy (bishop)
• John J. Hennessey
• John Joseph Hennessy
• John L. Hennessy
• John M. Hennessy
• John Pope Hennessy
• John Pope-Hennessy
• John W. Hennessey Jr