|Age:||68 (at death)|
|Date of birth:||March 5, 1942|
|Date of death:||September 20, 2010|
|Profession:||HPD: Police Officer|
|Played by:||William Sadler|
|Seasons:||Hawaii Five-0: 1|
John McGarrett (March 5, 1942 – September 20, 2010) was the father of Steve and Mary Ann McGarrett. He was also the mentor of Chin Ho Kelly, and was a retired deputy of HPD. On September 20, 2010, he was murdered by Victor Hesse.