The 2005 Acura Classic was a women's tennis tournament played on outdoor hard courts at the La Costa Resort and Spa in San Diego, California, United States.

It was part of Tier I of the 2005 WTA Tour.

It was the 27th edition of the tournament and was held from August 26 through August 7, 2005.

Sixth-seeded Mary Pierce won the singles title.

[1] Mary Pierce defeated Ai Sugiyama, 6–0, 6–3 Conchita Martínez / Virginia Ruano Pascual defeated Daniela Hantuchová / Ai Sugiyama, 6–7(7–9), 6–1, 7–5