The 2023 Halle Open (known for sponsorship reasons as the Terra Wortmann Open) was a men's tennis tournament played on outdoor grass courts. It was the 30th edition of the Halle Open and part of the ATP Tour 500 series of the 2023 ATP Tour. It took place at the OWL Arena in Halle, Germany, between 19 June and 25 June 2023. Unseeded Alexander Bublik won the singles title.
<sub>*per team</sub>
The following players received wildcards into the main draw:
The following player received entry using a protected ranking:
The following players received entry from the qualifying draw:
The following player received entry as lucky losers:
The following pairs received wildcards into the doubles main draw:
The following pair received entry from the qualifying draw: