| John Henry Guinness | |
| Birth Date: | 10 April 1935 |
| Nationality: | Irish |
| Education: | Eton College |
| Occupation: | Banker |
John Henry Guinness (10 April 1935 - 29 February 1988) was a son of Henry Eustace Guinness and was chairman of Guinness Mahon.[1]
Educated at Eton College, he attained the rank of officer in the Royal Navy. Later, he was named a director of Guinness Peat Group and served as chairman of Guinness and Mahon merchant bank. He married English-born Mary Jennifer Hollwey.[1] They had three children: Ian Richard Guinness (b. 15 March 1961), Gillian Sarah Guinness (b. 8 July 1962) and Tania Caroline Guinness (b. 10 February 1966).[1]
In 1986, he was pistol-whipped during his wife's kidnapping.[2] She was rescued by Garda Síochána later that month. John Henry Guinness died from a fall from Yr Wyddfa Mountain in North Wales on 29 February 1988, aged 52.[3]