The 2023 Split Open was a professional tennis tournament played on clay courts. It was part of the 2023 ATP Challenger Tour. It took place in Split, Croatia between 10 and 16 April 2023.
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
 Australia | Christopher O'Connell | 87 | 1 | |
 Austria | Jurij Rodionov | 120 | 2 | |
 Slovakia | Norbert Gombos | 130 | 3 | |
 Hungary | Fábián Marozsán | 133 | 4 | |
| Slovakia | Lukáš Klein | 139 | 5 | |
| Austria | Filip Misolic | 146 | 6 | |
 Italy | Mattia Bellucci | 154 | 7 | |
 Japan | Kaichi Uchida | 162 | 8 |
The following players received wildcards into the singles main draw:
The following player received entry into the singles main draw as a special exempt:
The following player received entry into the singles main draw using a protected ranking:
The following player received entry into the singles main draw as an alternate:
The following players received entry from the qualifying draw:
See main article: 2023 Split Open – Singles.
Zsombor Piros def. Norbert Gombos 7–6(7–2), 7–6(11–9).See main article: 2023 Split Open – Doubles.
Sadio Doumbia / Fabien Reboul def. 
Anirudh Chandrasekar / Vijay Sundar Prashanth 6–4, 6–4.
