2003 US Open – Girls' singles

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.

Seeds
• # 🇺🇸 Bethanie Mattek (third round)

• # Michaëlla Krajicek (final)

• # 🇸🇰 Jarmila Gajdosova (first round)

• # 🇧🇪 Kirsten Flipkens (champion)

• # 🇫🇷 Tatiana Golovin (quarterfinals)

• # 🇨🇿 Kateřina Böhmová (first round)

• # 🇵🇱 Marta Domachowska (third round)

• # 🇺🇸 Allison Baker (second round)

• # Vojislava Lukić (first round)

• # 🇫🇮 Emma Laine (third round)

• # 🇨🇿 Andrea Hlaváčková (third round)

• # 🇯🇵 Ryōko Fuda (quarterfinals)

• # 🇨🇦 Bei'er Ko (second round)

• # Nadja Pavic (second round)

• # 🇺🇦 Kateryna Bondarenko (semifinals)

• # 🇷🇺 Anna Chakvetadze (second round)