2004 Australian Open – Boys' singles

Marcos Baghdatis was the defending champion, but did not compete in the Juniors in this year.

Gaël Monfils defeated Josselin Ouanna (6–0, 6–3) in the final.

Seeds
• # 🇩🇪 Sebastian Rieschick (second round)

• # 🇩🇪 Mischa Zverev (quarterfinals)

• # 🇺🇸 Brendan Evans (quarterfinals)

• # 🇮🇳 Karan Rastogi (semifinals)

• # 🇺🇸 Scott Oudsema (third round)

• # 🇧🇷 Bruno Rosa (third round)

• # 🇫🇷 Josselin Ouanna (final)

• # 🇫🇷 Gaël Monfils (champion)

• # Remko de Rijke (first round)

• # Fritz Wolmarans (third round)

• # 🇫🇷 Julien Gely (second round)

• # 🇰🇷 Kim Sun-yong (third round)

• # 🇺🇸 Scoville Jenkins (quarterfinals)

• # 🇰🇷 Woong-Sun Jun (first round)

• # Vilim Višak (first round)

• # 🇳🇿 William Ward (first round)