Last year the charity raised £9m in the UK during the appeal, which starts this week.
Islam Relief receives about a third of its annual income over the course of the month, during which Muslims can choose to donate a portion of their wealth to charity. In 2011, the charity earmarked £4.1m from its Ramadan appeal for the Disasters Emergency Committee’s East Africa Crisis Appeal.
Jehangir Malik, UK director of Islamic Relief, said: "The government will match the public donations we receive pound for pound up to £5m, which means that our supporters can double their donations and we can double the impact of our work to support poor communities and lift people out of poverty."
Andrew Mitchell, Secretary of State for International Development, said the floods in Pakistan during 2010 and 2011 showed what a catastrophic impact natural disasters can have on poor communities in the developing world.
"Helping communities to prepare for the effects of climate change is fundamental to securing a safer future for them," he said.