The 2011 Estoril Open was a tennis tournament played on outdoor clay courts.

Both the men's and the women's events took place at the Estádio Nacional in Oeiras, Portugal, from 23 April through 1 May 2011.

The following players received wildcards into the main draw: The following players received entry from the qualifying draw: The following players received wildcards into the main draw: The following players received entry from the qualifying draw: Juan Martín del Potro defeated Fernando Verdasco, 6–2, 6–2 Anabel Medina Garrigues defeated Kristina Barrois, 6–1, 6–2.

Eric Butorac / Jean-Julien Rojer defeated Marc López / David Marrero, 6–3, 6–4.

Alisa Kleybanova / Galina Voskoboeva defeated Eleni Daniilidou / Michaëlla Krajicek, 6–4, 6–2.