The Law Ministry issued a formal notification appointing him as the top law officer of the NDA government.
The government has already appointed Ranjit Kumar as the Solicitor General. Six Additional Solicitors General have also been appointed.
Rohatgi took over from G E Vahanvati as the 14th AG of the country. Vahanvati had resigned following a change of the government at the Centre.
It is a convention that law officers step down after the change of government.
Rohatgi had recently said his top priority as Attorney General would be to "streamline litigations in the Supreme Court."
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"I will see and work out that the government department does not involve in litigations with each other," Rohatgi, who had also served as an Additional Solicitor General during previous NDA regime, had told PTI.
Rohatgi, son of former Delhi High Court judge Justice Awadh Behari Rohatgi, has represented Gujarat government in the Supreme Court in the 2002 Gujarat riots and fake encounter death cases, including the Best Bakery and Zahira Sheikh cases.
He has also been representing the Italian embassy in the apex court in a case relating to two Italian marines involved in the killing of two fishermen off the Kerala coast in 2012.
Besides some of these high-profile cases handled by him, Rohatgi has been appearing on behalf of big corporates in the 2G scam trial.