Boris Johnson is to urge the international community to back plans to get 40m more girls in developing countries in school, calling it “one of the smartest investments we can make”.
And he will take part in a video link-up with schoolchildren in Kenya to promote access to education for girls.
This is a focus of the UK’s presidency of the G7 group of leading economies.
But aid agencies have warned of the negative impact of the UK’s international aid cuts.
The prime minister will announce an extra £55m for a global education project to share information on what works best in improving school systems, particularly in Kenya, Rwanda, Sierra Leone and Pakistan.
Since his time as foreign secretary, Mr Johnson has argued that widening access for education for girls is a highly effective way of driving development in some of the world’s poorest countries, in places where girls had often been at risk of missing out on school.
As well as getting 40 million more girls into school, the G7’s target will be for 20 million more girls to be reading by the age of 10.
“Supporting girls to get 12 years of quality education is one of the smartest investments we can make as the world recovers from Covid-19. Otherwise, we risk creating a lost pandemic generation,” said Mr Johnson.
“Across the world there is a vast untapped resource – girls whose education has been cut short or denied altogether, who could be leading efforts to pull their communities out of poverty.”
But the prime minister has faced criticism that such calls on the international community come alongside £4bn cuts in UK overseas aid.