The 1989 Estoril Open was a women's tennis tournament played on outdoor clay courts at the Estoril Court Central in Oeiras, Portugal that was part of the Category 2 tier of the 1989 WTA Tour.

Third-seeded Isabel Cueto won the singles title.

Isabel Cueto defeated Sandra Cecchini 7–6(7–3), 6–2 Iva Budařová / Regina Rajchrtová defeated Gaby Castro / Conchita Martínez 6–2, 6–4

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