- Source: 2023 Oeiras Indoors II
The 2023 Oeiras Indoors II was a professional tennis tournament played on hard courts. It was the 2nd edition of the tournament which was part of the 2023 ATP Challenger Tour. It took place in Oeiras, Portugal from 9 to 14 January 2023.
Singles main-draw entrants
= Seeds
=1 Rankings are as of 2 January 2023.
= Other entrants
=The following players received wildcards into the singles main draw:
Jaime Faria
Gonçalo Oliveira
Pedro Sousa
The following player received entry into the singles main draw as a special exempt:
Joris De Loore
The following players received entry from the qualifying draw:
Gabriel Décamps
Elmar Ejupovic
Sebastian Fanselow
Cem İlkel
Mark Lajal
Dino Prižmić
Champions
= Singles
=Arthur Fils def. Joris De Loore 6–1, 7–6(7–4).
= Doubles
=Sander Arends / David Pel def. Patrik Niklas-Salminen / Bart Stevens 6–3, 7–6(7–3).