The 1999 Estoril Open was a tennis tournament played on outdoor clay courts at the Estoril Court Central in the Oeiras Municipality in Portugal that was part of the International Series of the 1999 ATP Tour and of Tier IVa of the 1999 WTA Tour.

Albert Costa and Katarina Srebotnik won the singles title.

The following players received wildcards into the singles main draw: The following players received wildcards into the doubles main draw: The following players received entry from the singles qualifying draw: The following players received entry as a lucky loser: The following player received entry from the doubles qualifying draw: Albert Costa defeated Todd Martin, 7–6(7–4), 2–6, 6–3 Katarina Srebotnik defeated Rita Kuti-Kis, 6–3, 6–1 Tomás Carbonell / Donald Johnson defeated Jiří Novák / David Rikl, 6–3, 2–6, 6–1 Alicia Ortuño / Cristina Torrens Valero defeated Anna Földényi / Rita Kuti-Kis, 7–6(7–4), 3–6, 6–3

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