| 1998 Toyota Princess Cup | |
|---|---|
| Date | 21–27 September |
| Edition | 2nd |
| Category | Tier II |
| Draw | 28S / 16D |
| Prize money | $450,000 |
| Surface | Hard / outdoor |
| Location | Tokyo, Japan |
| Venue | Ariake Coliseum |
| Champions | |
| Singles | |
 Monica Seles | |
| Doubles | |
 Anna Kournikova / Monica Seles | |
The 1998 Toyota Princess Cup was a women's tennis tournament played on outdoor hard courts at the Ariake Coliseum in Tokyo, Japan that was part of Tier II of the 1998 WTA Tour. It was the second edition of the tournament and was held from 21 September through 27 September 1998. Second-seeded Monica Seles won the singles title and earned $79,000 first-prize money.