The 2003 Toray Pan Pacific Open was a women's tennis tournament played on indoor carpet courts. It was the 20th edition of the Toray Pan Pacific Open, and was part of the Tier I Series of the 2003 WTA Tour. It took place at the Tokyo Metropolitan Gymnasium in Tokyo, Japan, from January 28 through February 2, 2003. Lindsay Davenport won the singles title.
See main article: 2003 Toray Pan Pacific Open – Singles. 
Lindsay Davenport defeated Monica Seles, 6–7(6–8), 6–1, 6–2
See main article: 2003 Toray Pan Pacific Open – Doubles. 
Elena Bovina / 
Rennae Stubbs defeated Lindsay Davenport / Lisa Raymond, 6–3, 6–4