The 2003 RCA Championships was a men's tennis tournament played on outdoor hard courts at the Indianapolis Tennis Center in Indianapolis in the United States and was part of the International Series of the 2003 ATP Tour.

It was the 16th edition of the tournament and ran from July 21 through July 27, 2003.

First-seeded Andy Roddick won the singles title.

Andy Roddick defeated Paradorn Srichaphan 7–6(7–2), 6–4 Mario Ančić / Andy Ram defeated Diego Ayala / Robby Ginepri 2–6, 7–6(7–3), 7–5