The 2003 Estoril Open was a tennis tournament played on outdoor clay courts at the Estoril Court Central in Oeiras in Portugal that was part of the International Series of the 2003 ATP Tour and of Tier IV of the 2003 WTA Tour.

Nikolay Davydenko and Magüi Serna won the singles title.

Nikolay Davydenko defeated Agustín Calleri 6–4, 6–3 Magüi Serna defeated Julia Schruff 6–4, 6–1 Mahesh Bhupathi / Max Mirnyi defeated Lucas Arnold / Mariano Hood 6–1, 6–2 Petra Mandula / Patricia Wartusch defeated Maret Ani / Emmanuelle Gagliardi 6–7(3–7), 7–6(7–3), 6–2 This article about sports in Portugal is a stub.

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