| Billy de Graaf | |
| Fullname: | Willem de Graaf |
| Birth Place: | Drachten, Netherlands |
| Position: | Midfielder |
| Clubs1: | Eastern Suburbs |
| Clubs2: | Mount Wellington |
| Years3: | 1973 |
| Clubs3: | Shelbourne |
| Caps3: | 1 |
| Goals3: | 0 |
| Years4: | 1981 |
| Clubs4: | Wollongong City |
| Caps4: | 25 |
| Goals4: | 1 |
| Years5: | 1982 |
| Clubs5: | Ringwood City |
| Nationalyears1: | 1969–1981 |
| Nationalteam1: | New Zealand |
| Nationalcaps1: | 22 |
| Nationalgoals1: | 7 |
Willem de Graaf (born c. 1951) is a former association football player who played as a midfielder. He represented the New Zealand national team at international level.
De Graaf made his full All Whites debut in a 0–0 draw with New Caledonia on 25 July 1969, and he ended his international playing career with 22 A-international caps and seven goals to his credit, his final cap gained in a 0–0 draw with Indonesia on 7 September 1981.[1] [2]