Reverend Aaron Burt Grosh (1803 – March 27, 1884), a Universalist minister, was one of the eight founders of the National Grange of the Order of Patrons of Husbandry, a fraternal organization in the United States. He had a major part in the design of the Grange ritual and was also responsible for the various songs used during various celebrations of the Grange. Grosh accepted a position in the U.S. Department of Agriculture soon after its establishment, where he served as the first Department Librarian of the United States National Agricultural Library from 1867 until 1869.