Stephen Patrick Sinko (born September 15, 1909 – March 1, 1999) was an American football player and coach. He played professionally as a guard and tackle in the National Football League (NFL) for the Boston Redskins from 1934 to 1936. Sinko served as the head football coach at Boston University from 1957 to 1963, compiling a record of 23–36–3. He was the line coach at Boston University under Aldo Donelli from 1947 to 1956. Sinko played college football at Duquesne University.