Louis Joseph Battan (February 9, 1923 – October 29, 1986) was an American atmospheric scientist who received his doctorate from the University of Chicago in 1953, where he was hired to work in the field of the physics of clouds and precipitation. In 1958 he was appointed professor of meteorology and associate director of the at the University of Arizona in Tucson. He was a pioneer in cloud physics and radar meteorology. Dr. Battan immigrated to the United States with his parents, Anibale and Louise Battan, from northern Italy, a region known as Trentino-Alto Adige.