She has made donations to historically black US colleges climate change group and health organisations.
Ms Scott posted about the gifts on social media also saying that she has changed her surname from Bezos.
She is the second richest woman in the world with a fortune of more then $62B according to Forbes.
She and Mr Bezos divorced last year.
The novelist who married Mr Bezos a year before he founded Amazon and was one of the firm's first employees received a 4% stake after the split.
Ms Scott announcement comes the day before Mr Bezos is scheduled to testify before US lawmakers in Washington. The hearing is part of a wider investigation into the power held by tech giants including Amazon Google and Facebook.
Shortly after announcing the divorce Ms Scott signed the Giving Pledge joining a campaign founded by billionaire investor Warren Buffett and ex Microsoft boss bill gates and his wife Melinda. It commits the wealthy to give away the majority of their fortunes to charity.
My own reflection after recent events revealed a dividend of privilege I'd been overlooking the attention i can call to organization and leaders driving.
She write in a blog post,

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