The 2023 Oeiras Indoors was a professional tennis tournament played on hard courts. It was the 1st edition of the tournament which was part of the 2023 ATP Challenger Tour. It took place in Oeiras, Portugal from 2 to 8 January 2023.
Singles main-draw entrants
Seeds
1 Rankings are as of 26 December 2022.
Other entrants
The following players received wildcards into the singles main draw: Jaime Faria Gonçalo Oliveira Pedro Sousa
The following players received entry from the qualifying draw: Joris De Loore Kenny de Schepper Cem İlkel Alibek Kachmazov Mark Lajal Dino Prižmić
The following player received entry as a lucky loser: Edan Leshem
Champions
Singles
Joris De Loore def. Filip Cristian Jianu 6–3, 6–2.
Doubles
Victor Vlad Cornea / Petr Nouza def. Jonathan Eysseric / Pierre-Hugues Herbert 6–3, 7–6(7–3).