See main article: 2005 Estoril Open.
Juan Ignacio Chela and Gastón Gaudio were the defending champions. Chela participated with Tommy Robredo this year, finishing runner-up. Gaudio did not participate this year.
František Čermák and Leoš Friedl won in the final 6–3, 6–4, against Juan Ignacio Chela and Tommy Robredo.