| 2005 Estoril Open | |
|---|---|
| Date | April 25 – May 2 | 
| Edition | 16th | 
| Surface | Clay / Outdoor | 
| Location | Oeiras,  Portugal | 
| Champions | |
| Men's Singles | |
|  Gastón Gaudio | |
| Women's Singles | |
|  Lucie Šafářová | |
| Men's Doubles | |
|  František Čermák /  Leoš Friedl | |
| Women's Doubles | |
|  Li Ting /  Sun Tiantian | |
The 2005 Estoril Open was a tennis tournament played on outdoor clay courts. This event was the 16th edition of the Estoril Open, included in the 2005 ATP Tour International Series and in the 2005 WTA Tour Tier IV Series. Both the men's and the women's events took place at the Estoril Court Central, in Oeiras, Portugal, from April 25 through May 2, 2005.
 Gastón Gaudio defeated
 Gastón Gaudio defeated  Tommy Robredo, 6–1, 2–6, 6–1
 Tommy Robredo, 6–1, 2–6, 6–1
 Lucie Šafářová defeated
 Lucie Šafářová defeated  Li Na, 6–7(4–7) 6–4, 6–3
 Li Na, 6–7(4–7) 6–4, 6–3