The 2023 Croatia Open (also known as the Plava Laguna Croatia Open Umag for sponsorship reasons) was a men's tennis tournament played on outdoor clay courts.

It was the 33rd edition of the Croatia Open, and part of the 250 Series of the 2023 ATP Tour.

It took place at the International Tennis Center in Umag, Croatia, from 24 through 30 July 2023.

[1] *per team The following players received wildcards into the main draw: The following players received entry from the qualifying draw: The following pairs received wildcards into the doubles main draw: