The 2003 Campionati Internazionali di Sicilia was a men's tennis tournament played on outdoor clay courts in Palermo, Italy and was part of the International Series of the 2003 ATP Tour. It was the 25th edition of the tournament and was held from 22 September until 28 September 2003. First-seeded Nicolás Massú won the singles title.
Nicolás Massú defeated Paul-Henri Mathieu 1–6, 6–2, 7–6(7–0)
Lucas Arnold / Mariano Hood defeated František Čermák / Leoš Friedl 7–6(8–6), 6–7(3–7), 6–3
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