Government funding will be allocated from the existing aid budget.
It is not yet clear how much from the overall amount raised by this year’s event will be allocated to women and girls in Africa. A spokeswoman for Comic Relief said the proportions that would go to different causes would be announced on Friday.
Justine Greening, the international development secretary, said: "In the 25 years since its creation, Red Nose Day has rightly become a national institution. The British public is passionate in supporting its work to change lives.
"This year, we’ll double the money that Comic Relief commits to its work helping girls and women in Africa. Having had International Women’s Day earlier this month, the message is clear – we must help to give girls and women a voice if we’re serious about transforming not only families and communities, but also economies and whole countries."
Red Nose Day takes place on 15 March. An evening of television comedy will be broadcast on BBC One, with celebrities and the public taking part in fundraising events around the UK.
Funds raised by Comic Relief go towards projects that tackle poverty and support vulnerable people in the UK and Africa.