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. His chief work was the classification and anatomy of arthropods, and contributions to economic entomology, zoogeography, and the phylogeny and metamorphoses of insects. Packard was appointed to the United States Entomological Commission in 1877 where he served with Charles Valentine Riley and Cyrus Thomas. He wrote school textbooks, such as Zoölogy for High Schools and Colleges (eleventh edition, 1904). His Monograph of the Bombycine Moths of North America was published in three parts (1895, 1905, 1915, edited by T. D. A. Cockerell).