The 1988 Suntory Japan Open Tennis Championships was a tennis tournament played on outdoor hard courts at the Ariake Coliseum in Tokyo in Japan that was part of the 1988 Nabisco Grand Prix and of the Category 2 tier of the 1988 WTA Tour.

The tournament ran from 11 April through 17 April 1988.

John McEnroe and Patty Fendick won the singles titles.

John McEnroe defeated Stefan Edberg 6–2, 6–2 Patty Fendick defeated Stephanie Rehe 6–3, 7–5 John Fitzgerald / Johan Kriek defeated Steve Denton / David Pate 6–4, 6–7, 6–4 Gigi Fernández / Robin White defeated Lea Antonoplis / Barbara Gerken 6–1, 6–4