The summit will address issues including economic resilience post-COVID-19, global health and human rights, Britain's Foreign Office said in a statement.
Among the ministers due to attend are those from Malaysia, Thailand and Indonesia, it said, adding that it was the first inclusion of ASEAN countries at a G7 foreign ministers' summit and this reflected "the UK's growing Indo-Pacific tilt".
Britain holds the rotating presidency of the G7 in 2021 and has already hosted the COP climate summit in Glasgow this month and the G7 leaders' summit in Carbis Bay in June.
