A Taliban suicide bomber detonated an explosives-packed car near the international airport in the capital, Kabul, killing at least three people and wounding 18.
The Foreign Office said: “We can confirm that a British national was tragically killed in a terrorist attack in Kabul this morning. We stand ready to provide consular assistance to the family.”
The incident comes just days after another Briton, who held joint Afghan nationality, was killed in an attack by the Taliban on a guest house in Kabul which left 14 people dead.
He was working for the British Council in the country when he was killed.
The attack this morning appears to have targeted vehicles of the European Union police training mission.
The car bomb was detonated near the office of the Afghan Civil Aviation Authority, which is a few hundred metres from the airport terminal.
A Taliban spokesman claimed responsibility for the attack.