The 2009 Bank of the West Classic was a tennis tournament played on outdoor hard courts.

It was the 38th edition of the Bank of the West Classic, and was part of the WTA Premier tournaments of the 2009 WTA Tour.

It took place at the Taube Tennis Center in Stanford, California, United States, from July 27 through August 2, 2009.

Players committed to participating in the singles event for 2009.

[1] The following players received wildcards into the singles main draw The following players received entry from the qualifying draw: Marion Bartoli defeated Venus Williams, 6–2, 5–7, 6–4 Serena Williams / Venus Williams defeated Yung-Jan Chan / Monica Niculescu, 6–4, 6–1