Lloyd Francis MacMahon (August 12, 1912 – April 8, 1989) was a United States district judge of the United States District Court for the Southern District of New York from 1959 to 1989 and its Chief Judge from 1980 to 1982.

Lloyd Francis MacMahon
New York Southern District Court
Chief Judge — U.S. District Court for the Southern District of New York
Born 1912 in Elmira, NY
Died 1989 in White Plains, NY
FJC ID: 1457
- Gender
- Male
- Race
- White
Prior employment
- Judicial Conference of the United StatesMember · 1980–1982
- Private practice, New York City1942–1953, 1955–1959
Chief assistant U.S. attorney · 1953–1955
U.S. attorney for the Southern District of New York1955- U.S. Naval Reserve lieutenant1944–1945
Appointments
1959–1989 · Appointed by Dwight D. Eisenhower (Republican)Term ended: Death
Education
LL.B. · 1938- Cornell UniversityA.B. · 1936