The Nigerian military rescued two Croats and one Montenegrin man who were abducted in the oil-producing Niger Delta, a state government spokesman said.
The three men, working for oil services company Hydrodive, were kidnapped on February 19th from a bar outside their base in the city of Port Harcourt.
"They were rescued from Ogbakiri last night by a military operation," an oil industry source said.
A community leader in Ogbakiri, a waterside village a few miles outside Port Harcourt, said troops had invaded the area shooting, made several arrests and had beaten up residents.
Two Italians and one Frenchman seized by different armed groups are still in captivity in the Niger Delta.
Thousands of foreign oil workers have fled Nigeria, the world's eighth-largest oil exporter, since an escalation in kidnappings and militant raids last year. A fifth of Nigeria's oil output has been shut by militant attacks for more than a year.