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Alpheus Spring Packard, Jr., LL.D. (February 19, 1839 – February 14, 1905) was an American entomologist and palaeontologist. He described over 500 new animal species- especially butterflies and moths- and was one of the founders of The American Naturalist.[1]

He was the son of Alpheus Spring Packard, Sr. (1798–1884) and the brother of William Alfred Packard. He was born in Brunswick,Maine and was Professor of Zoology and Geology at Brown University in Providence, Rhode Island from 1878 until his death. He was a vocal proponent of the Neo-Lamarckian theory of evolution.