| Intro | Modern pentathlete |
| Is |
Athlete Modern pentathlete |
| From | United Kingdom |
| Type | Sports |
| Gender | male |
| Birth | 26 April 1964, Plymouth |
| Age: | 56 years |
Dominic John Grehan Mahony MBE (born 26 April 1964) is a British former modern pentathlete. He competed in the 1988 Summer Olympics and at the 1992 Summer Olympics, winning a bronze medal at the 1988 Games.
Mahony was appointed Member of the Order of the British Empire (MBE) in the 2014 New Year Honours for voluntary services to modern pentathlon.