Edward Thomas O'Brien was an American runner who competed mainly in the 400 meters. He competed for the United States in the 1936 Summer Olympics held in Berlin, Germany, in the 4 × 400 meter relay, where he won the silver medal with his teammates Harold Cagle, Robert Young and Alfred Fitch.
- Occupation
- athletics competitor
- Citizenship
- United States
- Born
- September 12, 1914
- Died
- September 15, 1976