L'Oeiras Challenger è un torneo professionistico di tennis maschile, facente parte del circuito Challenger. Si gioca dal 2021 sui campi in terra rossa del Complexo Desportivo do Jamor a Oeiras, in Portogallo.
| Anno | Campione | Finalista | Punteggio |
| 2024 (II) |  Jaime Faria |  Elias Ymer | 3–6, 7–6(3), 6–4 |
| 2024 |  Francisco Comesaña |  Ugo Blanchet | 6–4, 3–6, 7–5 |
| 2023 (II) | Facundo Díaz Acosta |  Aleksandar Vukic | 6–4, 6–3 |
| 2023 |  Zsombor Piros | Juan Manuel Cerúndolo | 6–3, 6–4 |
| 2022 (III) |  Kaichi Uchida |  Kimmer Coppejans | 6–2, 6–4 |
| 2022 (II) | Gastão Elias (3) |  Alessandro Giannessi | 7–6(4), 6–1 |
| 2022 (I) | Gastão Elias (2) |  Nino Serdarušić | 6–3, 6–4 |
| 2021 (IV) | Gastão Elias (1) |  Holger Rune | 5–7, 6–4, 6–4 |
| 2021 (III) |  Carlos Alcaraz | Facundo Bagnis | 6–4, 6–4 |
| 2021 (II) | Pedro Cachín | Nuno Borges | 7–6(4), 7–6(3) |
| 2021 (I) |  Zdeněk Kolář | Gastão Elias | 6–4, 7–5 |
| Anno | Campioni | Finalisti | Punteggio |
| 2024 (II) |  Anirudh Chandrasekar
Arjun Kadhe | Simon Freund
Johannes Ingildsen | 7–5, 6–4 |
| 2024 | Filip Bergevi
 Mick Veldheer | Sergio Martos Gornés
 Petros Tsitsipas | 6–1, 6–4 |
| 2023 (II) |  Luke Johnson
Sem Verbeek (2) | Jaime Faria
Henrique Rocha | 6(6)–7, 7–5, [10–6] |
| 2023 |  Victor Vlad Cornea
Franko Škugor |  Marcelo Demoliner
Andrea Vavassori | 7–6(2), 7–6(4) |
| 2022 (III) | Sadio Doumbia
Fabien Reboul |  Robert Galloway
Alex Lawson | 6–3, 3–6, [15–13] |
| 2022 (II) | Nuno Borges (3)
Francisco Cabral (3) | Zdeněk Kolář
Adam Pavlásek | 6–4, 6–0 |
| 2022 (I) | Nuno Borges (2)
Francisco Cabral (2) |  Sanjar Fayziev
Markos Kalovelonis | 6–3, 6–0 |
| 2021 (IV) | Jesper de Jong
Tim van Rijthoven |  Julian Lenz
 Roberto Quiroz | 6–1, 7–6(3) |
| 2021 (III) | Hunter Reese
Sem Verbeek (1) | Sadio Doumbia
Fabien Reboul | 4–6, 6–4, [10–7] |
| 2021 (II) | Nuno Borges (2)
Francisco Cabral (1) |  Pavel Kotov
 Tseng Chun-hsin | 6–1, 6–2 |
| 2021 (I) | Mats Moraing
Oscar Otte | Riccardo Bonadio
 Denis Yevseyev | 6–1, 6–4 |
French
Deutsch
Portogallo 
Anirudh Chandrasekar
Elias Ymer
Francisco Comesaña
Ugo Blanchet
Aleksandar Vukic
Zsombor Piros
Kaichi Uchida.svg){kind=small}
Kimmer Coppejans
Alessandro Giannessi
Nino Serdarušić
Holger Rune
Carlos Alcaraz
Zdeněk Kolář
Mick Veldheer
Petros Tsitsipas.svg){kind=small}
Luke Johnson
Victor Vlad Cornea
Marcelo Demoliner
Robert Galloway
Sanjar Fayziev
Julian Lenz
Roberto Quiroz
Pavel Kotov
Tseng Chun-hsin
Denis Yevseyev