The US actress and singer, 78, will release the book in 2026, which will take readers through her career, struggles with substance abuse and love life.
Minnelli is one of just 25 performers to win an EGOT (Emmy, Grammy, Oscar, Tony) and is the daughter of actress Judy Garland and director Vincente Minnelli.
She is best known for her performances in 1972's Cabaret, TV concert film Liza With A Z and 1977's New York, New York.
Minnelli says she's been constantly approached to write about her extraordinary life.
"Since I was old enough to put pencil to paper, people asked me to write books about my career, my life, my loves, my family.
"Absolutely not. Tell it when I'm gone, was my philosophy. So, why did I change my mind?"
She felt documentaries about her career "didn't get it right", saying they were made by people she said "didn't know my family and don't really know me".
"Finally, I was mad as hell. Over dinner one night, I decided, it's my own damn story, I'm going to share it with you because of all the love you've given me."
The book was written with the help of Great American Songbook ambassador Michael Feinstein, who has been friends with Minnelli for 40 years.
"Today, after incredible events and life-threatening battles I am truly 'Lady Peaceful, Lady Happy', thank you all for loving me so much, being concerned about me," she said.
"I want you to know I'm still here, still kicking ass, still loving life and still creating."
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