Macron praised the DR Congo authorities "for their mobilisation and the effectiveness of their action" in obtaining the hostage's release, the office said in a statement, without identifying him.
Contacted by AFP, the president's office had no further information.
The French foreign ministry announced on March 2 that armed kidnappers had seized five gold mine workers, including a Frenchman, in eastern DR Congo.
The hostages worked for Banro, a Canadian gold mining corporation that runs two mines in DR Congo and is exploring for the mineral elsewhere in the vast, resource-rich country.
The French foreign ministry, which did not give the nationalities of the other victims, said it had no information on the identity of the attackers.