The 2009 Estoril Open was a tennis tournament played on outdoor clay courts. It was the 20th edition of the Estoril Open for the men, and was part of the ATP World Tour 250 series of the 2009 ATP World Tour, and of the International-level tournaments of the 2009 WTA Tour. Both the men's and the women's events took place at the Estádio Nacional in Oeiras, Portugal, from 2 May through 10 May 2009.