Conflict in Sudan's Darfur region has forced 50,000 people from their homes since the year began, the International Organisation for Migration says.
Millions of Sudanese have been displaced by the fighting
The group said this was the highest quarterly figure in three years.
The IOM warned the level of violence in Darfur had not lessened since fighting began in 2003, and was putting many areas beyond the reach of aid agencies.
Hundreds of thousands of people have died in the Darfur conflict, with more than 1.5m made homeless.
"Darfur is a difficult, dangerous conflict that has a good chance of getting worse," the IOM's head of operations in Darfur, Robbie Thompson, told journalists in Geneva.
An African Union peace force, which currently comprises 7,000 troops, has been in place for three years.
Earlier this week, Arab leaders agreed to pay for the AU peacekeeping force in Darfur from October this year, when its current funding runs out.
The United Nations had been making plans to take over the Darfur peace mission, but the Sudanese government objected to UN control of the mission.