The truce will see armed groups be given representation in the political arena in exchange for an end to attacks and rebel blockades.
It is part of an accord brokered by the Sant'Egidio Catholic Community.
"We commit to the immediate implementation by political- military groups of a country-wide ceasefire, to be monitored by the international community, as a fundamental step on the way to definitive peace," the deal read.
"The government undertakes to ensure military groups are represented at all levels," and are "recognised as part of the reconstruction efforts", it said.
The rebel groups pledged to ensure "the free movement of people and goods by removing illegal barriers as an immediate consequence of the ceasefire".
Sant'Egidio's president Marco Impagliazzo described the accord as "an historic agreement, a deal full of hope".
One of the world's poorest nations, CAR has been struggling to recover from a civil war between the Muslim and Christian militias that started in 2013.
Just as the country looked set to begin turning the page on years of bloodshed, a flare-up of sectarian violence last month killed more than 100 people.
Another 100,000 were forced to flee their homes in May, according to UN numbers.
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