2003 Wimbledon Championships – Men's singles

Roger Federer defeated Mark Philippoussis in the final, 7–6^(7–5), 6–2, 7–6^(7–3) to win the gentlemen's singles tennis title at the 2003 Wimbledon Championships. It was his first major title, the first of a record eight gentlemen's singles titles at Wimbledon, and the first of 20 major men's singles titles overall.

By virtue of winning the 1998 Wimbledon Boys’ title, Federer became just the fourth man in the Open Era to win the Boys’ and Gentlemen’s Wimbledon Championships, joining Björn Borg, Pat Cash, and Stefan Edberg.

Lleyton Hewitt was the defending champion, but was defeated in the first round by Ivo Karlović. Hewitt was the first man in the Open Era to lose in the first round of his Wimbledon title defence. As per tradition, defending champion Hewitt was playing the opening match on Centre Court – a situation he had unwittingly avoided the previous year (when reigning champion Goran Ivanišević withdrew) out of fear of the unpredictability of fresh grass.

With the losses of Hewitt, Andre Agassi and Juan Carlos Ferrero by the fourth round, a first-time major champion was guaranteed. This marked the first time in the Open Era that none of the quarterfinalists in a major had previously won a major singles title.

This tournament marked the major debut of future 22-time major champion, Olympic gold medalist, and world No. 1 Rafael Nadal (who was the youngest player in the draw at 17 years and 20 days of age); he lost to Paradorn Srichaphan in the third round. This tournament also marked the final major appearance of Olympic gold medalist Marc Rosset, who lost to Wesley Moodie in the first round. It was also notable for the absence of seven-time Wimbledon champion Pete Sampras, who had yet to announce his official retirement following his final match at the 2002 US Open.