Buffett, 80, and Gates, 55, who are close personal friends, were to meet with leading Indian businessmen at a luxury hotel in India's capital to deliver their pitch and exchange ideas on philanthropy.
The philanthropists announced last year that they would seek to persuade fellow billionaires to commit half of their wealth to good causes as part of "The Giving Pledge".
So far, 59 rich Americans have taken the pledge and the tycoons have said they want to take the campaign worldwide.
"We're not here to pressurise anybody," said Buffett, on his first trip to India.
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"Everybody has his own understanding of philanthropy."
"What the people in India do is entirely up to them."
During a World Tuberculosis Day event in Delhi on Thursday, Gates said: "What is encouraging is that so many people have an interest in philanthropy and have decided to discuss it."
Gates, who co-founded Microsoft, and Buffett, known as the "Oracle of Omaha" for his legendary investment acumen, met Chinese bi