Joseph Rosenmiller (February 17, 1925 – October 14, 2012) was an American businessman and philanthropist. Rosenmiller, along with Yale classmate , founded Greater Media, a media company specializing in radio in the eastern United States. Greater Media was known for spearheading the "magic radio" format. After retiring from Greater Media Rosenmiller donated to the , and later ran it. He also was the founder of Volunteer Opportunities. Rosenmiller attended Yale and Columbia University and served as a reconnaissance officer in World War II.