Monroe was born Norma Jeane Mortenson at the Los Angeles County Hospital on June 1, 1926 as the third child of Gladys Pearl Baker (née Monroe, 1902–1984).
Monroe lahir dengan nama Norma Jeane Mortenson di Los Angeles County Hospital pada tanggal 1 Juni 1926 sebagai anak ketiga dari Gladys Pearl Baker (née Monroe, 1902–1984).