The 2005 WTA Tour Championships, also known as the Sony Ericsson Championships, was a women's round robin tennis tournament played on indoor hard courts at the Staples Center in Los Angeles, United States.

Fourth-seeded Amélie Mauresmo won the singles event, the first French player to win the title, and she earned $1,000,000 first-prize money as well as 485 ranking points.

[1][2][3] Justine Henin-Hardenne had qualified for the tournament but withdrew due to a hamstring injury.

[4] Amélie Mauresmo defeated Mary Pierce, 5–7, 7–6(7–3), 6–4.

Lisa Raymond / Samantha Stosur defeated Cara Black / Rennae Stubbs, 6–7(5–7), 7–5, 6–4.