John S. Martin Jr. (born May 31, 1935) is a former United States district judge of the United States District Court for the Southern District of New York.

- Gender
- Male
- Race
- White
Prior employment
- Private practice, New York City1969–1980, 1983–1990
U.S. attorney for the Southern District of New York1980–1983
U.S. Department of JusticeAssistant to the solicitor general · 1967–1969- Private practice, Nyack, New York1966–1967
Assistant U.S. attorney · 1962–1966
Law clerk , Hon. Leonard P. Moore · 1961–1962
Appointments
1990–2003 · Appointed by George H.W. Bush (Republican)Term ended: Retirement
Education
LL.B. · 1961- Manhattan CollegeB.A. · 1957