Adler died in Los Angeles, a spokesperson for Spielberg's production company, Amblin Entertainment, confirmed to The Hollywood Reporter.
A former concert pianist and painter, Adler died at her home surrounded by her family.
Born in Cincinnati, Leah Frances Posner developed a love of music when she learned piano at age 5. She studied at the Music Conservatory in town and graduated from the University of Cincinnati with a degree in home economics.
In February 1945, she married electrical engineer Arnold Meyer Spielberg, and they had four children - Steven, Anne, Sue and Nancy.
In addition to Spielberg and his wife Kate Capshaw, survivors also include her daughters Anne (and husband Dan), Sue (Jerry) and Nancy (Shimon), 11 grandchildren and five great-grandchildren.
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