John Alfred Sines (August 13, 1914 – April 16, 1978) was an American professional basketball player as well as head coach at the high school and college levels. After his collegiate career at Purdue University, Sines played for the Indianapolis Kautskys in the National Basketball League for several seasons and averaged 7.2 points per game. Sines moved to Palmetto, Florida and coached Palmetto High School's basketball team for one season (1963–64) before being hired by Manatee Community College. At Manatee, he coached from 1964 to 1977 before retiring.