The 2003 International Raiffeisen Grand Prix was a tennis tournament played on outdoor clay courts in Sankt Pölten in Austria and was part of the International Series of the 2003 ATP Tour. The tournament ran from May 19 through May 25, 2003. Andy Roddick won the singles title.
Andy Roddick defeated Nikolay Davydenko 6–3, 6–2
- It was Roddick's 1st title of the year and the 8th of his career.
Simon Aspelin / Massimo Bertolini defeated Sargis Sargsian / Nenad Zimonjić 6–4, 6–7(8–10), 6–3
- It was Aspelin's 1st title of the year and the 2nd of his career. It was Bertolini's 1st title of the year and the 1st of his career.