| William Stack | |
| Nationality: | British |
| Sport: | Boxing |
| Birth Date: | 30 September 1936 |
| Birth Place: | Leamington Spa, England |
| Death Place: | Leamington Spa, England |
William Joseph Stack (30 September 1936 - 7 August 2013) was a British boxer. He competed in the men's middleweight event at the 1964 Summer Olympics and fought as Willie Stack.[1] At the 1964 Summer Olympics, he lost in his first fight to Emil Schulz of the United Team of Germany.[1]
Stack won the 1964 Amateur Boxing Association British middleweight title, when boxing out of the Leamington Boys Club.[2]