2003 Davidoff Swiss Indoors
Date	20–26 October
Edition	34th
Category	International Series
Draw	32S / 16D
Prize money	$975,000
Surface	Carpet / indoor
Location	Basel, Switzerland
Venue	St. Jakobshalle
Champions
Singles
Guillermo Coria[1]
Doubles
Mark Knowles / Daniel Nestor[2]
← 2002 · Swiss Indoors · 2004 →

The 2003 Davidoff Swiss Indoors was a men's tennis tournament played on indoor carpet courts at the St. Jakobshalle in Basel in Switzerland and was part of the International Series of the 2003 ATP Tour. The tournament ran from 20 October through 26 October 2003. Unseeded Guillermo Coria won the singles title.

Finals

Singles

Guillermo Coria defeated David Nalbandian by walkover

• It was Coria's 5th title of the year and the 6th of his career.

Doubles

Mark Knowles / Daniel Nestor defeated Lucas Arnold / Mariano Hood 6–4, 6–2

• It was Knowles' 6th title of the year and the 30th of his career. It was Nestor's 6th title of the year and the 32nd of his career.