Harry J. "Little" Long (December 28, 1897 – December 8, 1945) was an American college football coach and professor of biology and brother of Fred T. Long. He was born in Decatur, Illinois and graduated from Decatur High School in 1915. He enrolled at the James Millikin University in the fall of 1915 and graduated with a Bachelor of Arts degree in 1919, having majored in biology and minored in mathematics. He completed his Master of Arts degree in biology at Columbia University in New York in 1928 and was working on completing his Doctorate at the University of Michigan before his untimely death in 1945.