John Value Dennis (1915/1916 – December 1, 2002) was an American ornithologist and botanist. Dennis was an undergraduate at George Washington University but his study was interrupted by World War II. During the war, he served as a radar technician with the Flying Tigers aircraft unit in China. He finished his undergraduate education at the University of Wisconsin, obtaining a degree in political science. This was followed by a master's degree in botany from the University of Florida. He started (but did not complete) a PhD in ornithology at the University of Illinois.