2023 Lisboa Belém Open

The 2023 Lisboa Belém Open was a professional tennis tournament played on outdoor clay courts. It was the seventh (men) and third (women) editions of the tournament which were part of the 2023 ATP Challenger Tour and the 2023 ITF Women's World Tennis Tour. It took place in Lisbon, Portugal between 2 and 8 October 2023. It was Pedro Sousa last professional event before he retired.

Seeds

 * 1 Rankings are as of 25 September 2023.

Other entrants
The following players received wildcards into the singles main draw:
 * Gastão Elias
 * João Sousa
 * Pedro Sousa

The following player received entry into the singles main draw as a special exempt:
 * 🇪🇸 Oriol Roca Batalla

The following players received entry from the qualifying draw:
 * 🇪🇸 Javier Barranco Cosano
 * 🇮🇹 Enrico Dalla Valle
 * 🇮🇹 Francesco Forti
 * 🇺🇦 Oleksii Krutykh
 * Luka Mikrut
 * 🇮🇹 Alexander Weis

The following players received entry as lucky losers:
 * Henri Laaksonen
 * Henrique Rocha

Seeds

 * 1 Rankings are as of 25 September 2023.

Other entrants
The following players received wildcards into the singles main draw:
 * 🇺🇸 Baylen Brown
 * Carolina Mesquita
 * 🇧🇷 Giulia Pereira De Aguiar
 * Carla Tomai

The following players received entry from the qualifying draw:
 * 🇷🇴 Ilinca Amariei
 * 🇪🇸 Claudia Hoste Ferrer
 * Živa Falkner
 * 🇪🇸 Andrea Lázaro García
 * 🇷🇸 Katarina Jokić
 * 🇨🇿 Aneta Kučmová
 * 🇫🇷 Yasmine Mansouri
 * 🇪🇸 Guiomar Maristany

The following players received entry as lucky losers:
 * 🇫🇷 Alice Ramé

Men's singles

 * 🇮🇹 Flavio Cobolli def. Benjamin Hassan 7–5, 7–5.

Women's singles

 * 🇺🇦 Katarina Zavatska def. 🇧🇬 Gergana Topalova 6–3, 2–6, 7–5.

Men's doubles

 * 🇵🇱 Karol Drzewiecki / 🇨🇿 Zdeněk Kolář def. Jaime Faria /  Henrique Rocha 6–2, 7–6(7–5).

Women's doubles

 * 🇻🇪 Andrea Gámiz / Eva Vedder def. 🇩🇪 Tayisiya Morderger / 🇩🇪 Yana Morderger 6–1, 6–2.