Brewer's appointment comes after Amazon last year said it was adopting a new policy to promote diversity on its board.

Amazon's ten-member board now has four women including Brewer, Jamie Gorelick, Judith McGrath, Patricia Stonesifer.

Brewer, who has been with Starbucks for nearly two years, was previously CEO of Walmart Inc's warehouse chain Sam's Club.

Brewer has also been appointed to Amazon's leadership development and compensation committee of the board, the company said in a regulatory filing.

(This story corrects to say Rosalind Brewer is the second black female director, not first black director.)

(Reporting by Nivedita Balu in Bengaluru; Editing by Anil D'Silva)