2005 Australian Open – Boys' singles

Gaël Monfils was the defending champion, but did not compete in the Juniors in this year.

Donald Young defeated Kim Sun-yong (6–2, 6–4) in the final.

Seeds
• # 🇰🇷 Kim Sun-yong (final)

• # 🇺🇸 Donald Young (champion)

• # 🇸🇰 Lukáš Lacko (quarterfinals)

• # Robin Haase (semifinals)

• # Chu-Huan Yi (second round)

• # 🇺🇦 Sergei Bubka (semifinals)

• # 🇺🇸 Timothy Neilly (quarterfinals)

• # 🇨🇿 Dušan Lojda (third round)

• # 🇫🇷 Jérémy Chardy (second round)

• # 🇺🇸 Tim Smyczek (first round)

• # 🇸🇰 Pavol Červenák (third round)

• # 🇺🇦 Alexandr Dolgopolov (second round)

• # Thiemo de Bakker (second round)

• # Franko Škugor (third round)

• # 🇩🇪 Jochen Schoettler (third round)

• # Martin Pedersen (second round)