| Champ: |  Kirsten Flipkens |
| Runner: | Michaëlla Krajicek |
| Score: | 6–3, 7–5 |
| Before Name: | US Open – Girls' singles |
See main article: 2003 US Open (tennis).
Maria Kirilenko was the defending champion, but did not compete in the juniors that year.
Kirsten Flipkens won the tournament, defeating Michaëlla Krajicek in the final, 6–3, 7–5.