William P. O'Brien (police commissioner)
William P. O'Brien | |
|---|---|
| Born | June 15, 1891 Greenpoint, Brooklyn, New York State |
| Died | December 17, 1960 (aged 69) |
| Police career | |
| Department | New York Police Department |
| Service years | 1916–1950 |
| Rank | Commissioner |
William P. O'Brien (June 15, 1891 – December 17, 1960) was an American law enforcement officer who served as New York City Police Commissioner from 1949 to 1950.