The 1989 Dutch Open was a men's Grand Prix tennis tournament staged at 't Melkhuisje in Hilversum, Netherlands and played on outdoor clay courts. It was the 32nd edition of the tournament was held from 24 July to 30 July 1989. Eighth-seeded Karel Nováček won the singles title.
See main article: 1989 Dutch Open – Singles. Karel Nováček defeated 
Emilio Sánchez 6–2, 6–4
See main article: 1989 Dutch Open – Doubles. Tomás Carbonell / Diego Pérez vs. Paul Haarhuis / Mark Koevermans, final cancelled due to rain