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. It was the 35th edition of the year-end singles championships, the 30th edition of the year-end doubles championships, and was part of the 2005 WTA Tour. The tournament was held between November 8 and November 13, 2005. 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. Justine Henin-Hardenne had qualified for the tournament but withdrew due to a hamstring injury.

Finals

Singles

🇫🇷 Amélie Mauresmo defeated 🇫🇷 Mary Pierce, 5–7, 7–6(7–3), 6–4.

Doubles

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