1989 Suntory Japan Open Tennis Championships
Date	17–23 April
Edition	16th
Category	Grand Prix (ATP) Tier V (WTA)
Surface	Hard / outdoor
Location	Tokyo, Japan
Venue	Ariake Coliseum
Champions
Men's singles
Stefan Edberg[1]
Women's singles
Kumiko Okamoto
Men's doubles
Ken Flach / Robert Seguso[2]
Women's doubles
Jill Hetherington / Elizabeth Smylie
← 1988 · Japan Open · 1990 →

The 1989 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 1989 Nabisco Grand Prix and of Category 2 of the 1989 WTA Tour. The tournament was held from April 17 through April 23, 1989. Stefan Edberg and Kumiko Okamoto won the singles titles.

Finals

Men's singles

Stefan Edberg defeated Ivan Lendl 6–3, 2–6, 6–4

• It was Edberg's 1st singles title of the year and the 34th of his career.

Women's singles

Kumiko Okamoto defeated Elizabeth Smylie 6–4, 6–2

• It was Okamoto's only singles title of the year and the 1st of her career.

Men's doubles

Ken Flach / Robert Seguso defeated Kevin Curren / David Pate 7–6, 7–6

• It was Flach's 1st title of the year and the 25th of his career. It was Seguso's 1st title of the year and the 25th of his career.

Women's doubles

Jill Hetherington / Elizabeth Smylie defeated Ann Henricksson / Beth Herr 6–1, 6–3

• It was Hetherington's 3rd title of the year and the 9th of her career. It was Smylie's 3rd title of the year and the 24th of her career.