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.

Lleyton Hewitt was the defending champion, but was defeated in the first round by Ivo Karlović. Hewitt was only the second man to lose in the first round of his Wimbledon title defence, after Manuel Santana in 1967. As per tradition, defending champion Hewitt was playing the opening match on Centre Court – a situation he had willingly 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); he lost to Paradorn Srichaphan in the third 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.