2003 RCA Championships
Date	July 21–27
Edition	16th
Category	International Series
Draw	48S / 16D
Prize money	$575,000
Surface	Hard / outdoor
Location	Indianapolis, IN, US
Venue	Indianapolis Tennis Center
Champions
Singles
Andy Roddick[1]
Doubles
Mario Ančić / Andy Ram[2]
← 2002 · Indianapolis Tennis Championships · 2004 →

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.

Finals

Singles

Andy Roddick defeated Paradorn Srichaphan 7–6^(7–2), 6–4

• It was Roddick's 3rd title of the year and the 10th of his career.

Doubles

Mario Ančić / Andy Ram defeated Diego Ayala / Robby Ginepri 2–6, 7–6^(7–3), 7–5

• It was Ančić's only title of the year and the 1st of his career. It was Ram's 1st title of the year and the 1st of his career.