Aaron Eckhart was born on March 12, 1968, in Cupertino, California, the son of Mary Martha Eckhart (née Lawrence), a writer, artist, and poet, and James Conrad Eckhart, a computer executive. He is the youngest of three brothers. His father is of German-Russian descent, while his mother has English, German, Scots-Irish, and Scottish ancestry. He was raised as a Mormon in The Church of Jesus Christ of Latter-day Saints, and served a two-year mission in France and Switzerland. Eckhart's family relocated to England in 1981, following his father's job in information technology. The family moved around Surrey, living in towns such as Cobham, Ripley, and Walton-on-Thames. While living in England, Eckhart attended American Community School, where he was first introduced to acting, starring in a school production as Charlie Brown. In 1985, Eckhart moved to Australia and settled in Sydney, where he attended American International School of Sydney for his high school senior year; he further developed his acting skills in productions like Waiting for Godot, where he admits that he gave a "terrible" performance. In the autumn of his senior year, Eckhart left school to take a job at the Warringah Mall movie theater. He eventually earned his diploma through an adult education course. This also allowed Eckhart time to enjoy a year of surfing in Hawaii and France, as well as skiing in the Alps. In 1988, Eckhart returned to the United States and enrolled as a film major at Brigham Young University–Hawaii, but later transferred to Brigham Young University (BYU) in Provo, Utah. He graduated in 1994 with a Bachelor of Fine Arts degree. His fortunes changed for the better when he was offered the role of George in the film Erin Brockovich, which gave his failing career a much needed boost. He was then flooded with film offers and before long established himself as a respected character actor in Hollywood.

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