The 2023 Slovak Open was a professional tennis tournament played on hard courts. It was the 25th edition of the tournament which was part of the 2023 ATP Challenger Tour and the tenth edition of the tournament which was part of the 2023 ITF Women's World Tennis Tour. It took place in Bratislava, Slovakia between 9 and 15 October 2023 for the men and 30 October and 5 November for the women.
Champions
Men's singles
Gabriel Diallo def. Joris De Loore 6–0, 7–5.
Women's singles
vs.
Men's doubles
Sriram Balaji / Andre Begemann def. Andrey Golubev / Denys Molchanov 6–3, 5–7, [10–8].
Women's doubles
/ vs. /
Men's singles main-draw entrants
Seeds
1 Rankings are as of 25 September 2023.
Other entrants
The following players received wildcards into the singles main draw: Norbert Gombos Andrew Paulson Lukáš Pokorný
The following player received entry into the singles main draw using a protected ranking: Jiří Veselý
The following players received entry into the singles main draw as special exempts: Arthur Fery Benjamin Hassan
The following players received entry from the qualifying draw: Gabi Adrian Boitan Martin Damm Peter Gojowczyk Kalin Ivanovski Illya Marchenko Dennis Novak
The following players received entry as lucky losers: Cem İlkel Matteo Martineau Akira Santillan
Women's singles main-draw entrants
Seeds
1 Rankings are as of 23 November 2023.
Other entrants
The following players received wildcards into the singles main draw: Renáta Jamrichová Katarína Kužmová Eszter Méri Nina Vargová
The following players received entry from the qualifying draw: Alevtina Ibragimova Valeriia Olianovskaia Mia Pohánková Lara Schmidt Katarína Strešnáková Stephanie Wagner Angelina Wirges Radka Zelníčková
The following players received entry as lucky losers: Aneta Laboutková Emma Tóthová