The 1989 Seoul Open was a men's tennis tournament played on outdoor hard courts at the Seoul Olympic Park Tennis Center in Seoul in South Korea that was part of the 1989 Nabisco Grand Prix circuit.

The tournament was held from April 10 through April 17, 1989.

Unseeded Robert Van't Hof won the singles title.

[3] Robert Van't Hof defeated Brad Drewett 7–5, 6–4 Scott Davis / Paul Wekesa defeated John Letts / Bruce Man-Son-Hing 6–2, 6–4