| 2003 Croatia Open | |
|---|---|
| Date | 21–27 July |
| Edition | 14th |
| Category | International Series |
| Draw | 32S / 16D |
| Prize money | $375,000 |
| Surface | Clay / outdoor |
| Location | Umag, Croatia |
| Venue | ITC Stella Maris |
| Champions | |
| Singles | |
 Carlos Moyá [1] | |
| Doubles | |
| Álex López Morón / Rafael Nadal [2] | |
The 2003 Croatia Open was a men's tennis tournament played on outdoor clay courts at the ITC Stella Maris in Umag in Croatia and was part of the International Series of the 2003 ATP Tour. It was the 14th edition of the tournament and was held from 21 July through 27 July 2003. First-seeded Carlos Moyá won his third consecutive singles title at the event and fourth in total.
