The newly admired billionaire has signed the Giving Pledge, which encourages the world's richest people to acquire a majority of their wealth for charitable causes, either in their lives or in their will.
The initiative was launched by Warren Buffett and Bill and Melinda Gates in 2010 and has so far attracted the support of 204 people and families.
Her personal wealth is now worth an estimated $ 36.6 billion. Her former husband leads global rankings with a net worth of around $ 114 billion.
MacKenzie Bezos said in a letter that moved "I have a disproportionate amount of money to share."
"My approach to philanthropy will continue to be thought through. It will take time and effort and care, but I will not wait. And I will hold it until security is empty," she said in the letter, dated 25. May and published Tuesday. 1
MacKenzie Bezos was one of 19 new Giving Pledge signers announced on Tuesday.
The group also included Brian Acton, co-founder of WhatsApp, Paul Sciarra, co-founder of Pinterest, and Brian Armstrong, CEO of Coinbase, a crypto exchange.
"This generosity is a reflection of the inspiration we take from the many millions of people who work calmly and effectively to create a better world for others, often by great personal sacrifice," Buffett said in a statement Tuesday.