Chaudhry will replace Moazzam Khan, who has been Pakistan's Deputy Permanent Representative at the United Nations headquarters in New York.
Chaudhry took charge as the spokesman today.
He was earlier the ambassador to the Netherlands and has considerable expertise in India-Pakistan relations.
Chaudhry was Additional Secretary (South Asia) at the time of the Mumbai attacks in November 2008 and was part of the team of Pakistani diplomats that handled the fallout of the attack on India's financial hub.