Michelle Obama's memoir is coming out in November.
The former first lady tweeted Sunday that the book is called Becoming. She is calling her memoir a "deeply personal experience".
The former first lady and her husband, former President Barack Obama, last year reached a joint agreement with Penguin Random House for their respective books.
The deal is believed to be well in excess of $US30 million ($A42 million).
Memoirs by former first ladies usually sell well and Michelle Obama's memoir is highly anticipated.
She is admired around the world and has never told her story at length. Her only previous book was a 2012 work on gardening, American Grown.
Barack Obama, who has written the top sellers Dreams from My Father and The Audacity of Hope, has not yet scheduled his memoir.
Australian Associated Press
