Stephen Patrick Sinko (September 14, 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 and the Los Angeles Bulldogs from 1937 to 1938.

Sinko served as the head football coach at Boston University from 1957 to 1963, compiling a record of 23–36–3.

[3] In early 1946, Sinko was hired as an assistant coach for the Miami Seahawks of the All-America Football Conference AAFC).

[6][2] Sinko return to Boston University in 1951, once again assisting Donelli before succeeding him as head football coach in 1957.