According to local reports, the blast originated near the Acropolis in the Greek capital on Friday morning.
Emergency crews recovered six bodies following the explosion in the Plaka tourist district, Greek broadcaster ERT said.
The Briton and his partner, who were reportedly both in their 70s. lived on the second floor of the building overlooking the Hadrian’s Gate monument.
American nationals who had been staying in a short-term rental on the first floor were also killed, ERT said.
The blast is believed to have been caused by a massive gas leak, Athens mayor Haris Doukas said on Friday night.
A spokesperson for the Foreign, Commonwealth and Development Office said: “We are aware of a suspected explosion in Athens and are in touch with the local authorities.
“We stand ready to offer assistance to British nationals abroad 24/7.”
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