The 2004 WTA Tour Championships was a women's round robin tennis tournament played on indoor hard courts at the Staples Center in Los Angeles, United States.

Sixth-seeded Maria Sharapova won the singles event, the first, and so far only, Russian to win the tournament, and 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 illness (cytomegalovirus).

[4] Maria Sharapova defeated Serena Williams, 4–6, 6–2, 6–4.

Nadia Petrova / Meghann Shaughnessy defeated Cara Black / Rennae Stubbs, 7–5, 6–2.