The Chairman of the USD 100 billion conglomerate has also hit out at the Opposition, media and "some members of ruling party", saying it is "grossly misdirected" to single out the Prime Minister and blame him for the economic woes that the country is facing at present.
"Now is the moment in time our Prime Minister must break convention, restore government credibility, place the country on a growth path once again by implementing promised reforms, removing roadblocks to growth and controlling crony capitalism," Tata tweeted.
He said "government action has been too little too late" as India has lost growth momentum over the past 12 months with investment confidence declining and inflation soaring.
"...but to single out and blame the Prime Minister is grossly misdirected," Tata tweeted, saying he was "depressed to see the attacks on India" and "felt obliged to express my feelings".
Throwing his weight behind Singh, Tata said: "It is sad and unfortunate that in the past few months the Opposition, the media, some private citizens and even some members of the ruling party have mercilessly spoken and written about our Prime Minister - a person who was the architect of the `91 reforms, which brought economic prosperity and international recognition to our country."
They have also chosen to overlook the fact that this warm-hearted Prime Minister has led our country with great personal dignity and integrity, Tata added.