2003 Australian Open – Boys' singles

Boys' singles
2003 Australian Open
Champion Marcos Baghdatis
Runner-up Florin Mergea
Score6–4, 6–4

Clément Morel was the defending champion, but did not compete in the Juniors in this year.

Marcos Baghdatis defeated Florin Mergea (6–4, 6–4) in the final. Baghdatis would later reach the final of the men's tournament in 2006, losing to Roger Federer.