Harry Walter "Buck" Ewing (July 18, 1888 – March 11, 1962) was an American football player, coach of football, basketball and baseball, and college athletics administrator. He was a 1909 graduate of University of Nebraska where he played football. Ewing served as the head football coach at Morningside College (1911), South Dakota State College (1912–1917), Ohio Wesleyan University (1919–1921), Miami University (1922–1923), and Otterbein College (1935–1938, 1942–1945, 1951–1954), compiling a career college football record of 82–82–10. He was also the head basketball coach at South Dakota State (1912–1913, 1914–1917), Ohio Wesleyan (1919–1920), Miami (1922–1924), and Otterbein (1942–1952), tallying a career college basketball mark of 117–111–1.