Erminnie A. Smith, née Erminnie Adele Platt (1836—1886) was an anthropologist at the Smithsonian Institution's Bureau of American Ethnology.
Erminnie Smith published works on the Iroquois people, she was active in collecting their legends and employed John Napoleon Brinton Hewitt to assist in this work.
Erminnie Adele Platt was born in 1836, graduating in 1853 from the Troy Seminary in New York. She married Simeon H. Smith. The Aesthetic Society of Jersey City was founded by her in 1876.
She died in May, 1886.