The 2025 Hamburg Open was a combined men's and women's tennis tournament played on outdoor clay courts. It was the 119th edition of the event for the men and the 23rd edition for the women. The event is classified as an ATP Tour 500 tournament on the 2025 ATP Tour and as a WTA 250 tournament on the 2025 WTA Tour (a WTA 125 tournament the previous year). It took place at Am Rothenbaum in Hamburg, Germany between 18 and 24 May 2025 for the men, and between 14 and 20 July 2025 for the women.

The following players received wildcards into the main draw:

The following players received entry from the qualifying draw:

The following player received entry as a lucky loser:

The following pairs received wildcards into the doubles main draw:

The following pair received entry from the qualifying draw:

The following players received wildcards into the main draw:

The following players received entry using a protected ranking: