The 2004 Toray Pan Pacific Open was a women's tennis tournament played on indoor carpet courts. It was the 21st edition of the Toray Pan Pacific Open, and was part of the Tier I Series of the 2004 WTA Tour. It took place at the Tokyo Metropolitan Gymnasium in Tokyo, Japan, from January 30 through February 8, 2004. Lindsay Davenport won the singles title.
See main article: 2004 Toray Pan Pacific Open – Singles. 
Lindsay Davenport defeated Magdalena Maleeva, 6–4, 6–1
See main article: 2004 Toray Pan Pacific Open – Doubles. Cara Black / 
Rennae Stubbs defeated 
Elena Likhovtseva / Magdalena Maleeva, 6–0, 6–1