John Schaeffer

John Schaeffer may refer to:
 * John Schaeffer (art collector) (1941–2020), Australian art collector and businessman
 * John Schaeffer (environmentalist) (born 1949), American solar power advocate
 * John Schaeffer (trainer) (born 1951), American fitness trainer and author
 * John Nevin Schaeffer (1882–1942), American classicist