| William P. Mahoney Jr. | |
| Office: | 3rd United States Ambassador to Ghana |
| President: | John F. Kennedy Lyndon B. Johnson |
| Term Start: | June 22, 1962 |
| Term End: | May 26, 1965 |
| Predecessor: | Francis H. Russell |
| Successor: | Franklin Williams |
| Birth Date: | 27 November 1916 |
| Birth Place: | Prescott, Arizona |
| Death Place: | Phoenix, Arizona |
| Party: | Democratic |
William P. Mahoney Jr. (November 27, 1916 – April 27, 2000) was an American attorney who served as the United States Ambassador to Ghana from 1962 to 1965.[1] [2] He is the father of Richard Mahoney,[3] and the son of W. P. Mahoney (William P. Mahoney Sr.), a former Arizona state senator.[4]