Matt Coulthard triumphed at the British Firefighter Challenge competition held at Du Montford University, Leicester.
He won gold in the British category at the July 29 race which involved eight demanding physical tasks.
He also joined a Humberside firefighters team for the team relay, where his contribution earned the team a silver medal.
He then won a silver medal in the overall competition against 120 firefighters from UK, Australia, Germany, USA, Austria, and France.
The Gibraltar Fire and Rescue Service said “We would like to congratulate firefighter Matthew Coulthard for his fantastic effort and outstanding achievement at this international event.
Matt is a true ambassador for the GFRS and has no doubt put Gibraltar on the map once again.”