Amanda Leigh Moore was born in Nashua, New Hampshire, on April 10, 1984, to Stacy (Friedman), a former news reporter, and Don Moore, an airline pilot. During her childhood, her family moved to Orlando, Florida, where she was raised. She has Russian Jewish (from her maternal grandfather), English, Scottish, and Irish, ancestry.
After seeing the musical "Oklahoma!", she decided that she wanted to pursue a career in singing. As a child, she performed the National Anthem at several athletic events around her hometown of Orlando, Florida, and became known as the "National Anthem girl". At the ripe age of fourteen, while she was recording in a studio in Orlando, a Fed-Ex worker who happened to be passing through heard her and was interested in her talent. He happened to know someone at Sony as well. Moore worked on cutting a demo and shortly thereafter signed a record deal with Sony 550 Music. At 15, her first record "So Real" was released. Her first tour was with the Backstreet Boys.