The 2025 Swiss Indoors Basel was a men's tennis tournament played on indoor hard courts. It was the 54th edition of the event, and part of the ATP 500 tournaments of the 2025 ATP Tour. It was held at the St. Jakobshalle in Basel, Switzerland, from 20 to 26 October 2025.
João Fonseca (Brazil, ATP 46) won the final against Alejandro Davidovich Fokina (Spain, ATP 18) 6:3, 6:4. Fonseca thus becomes the second teenager after Jim Courier to win the Swiss Indoors. In doubles, the pairing of Marcel Granollers (Spain) and Horacio Zeballos (Argentina) triumphed, defeating Adam Pavlasek (Czech Republic) and Jan Zielinski (Poland) 6:2, 7:5 in the final.
The following players received wildcards into the singles main draw:
The following player received entry using a protected ranking:
The following player using a special exempt:
The following players received entry from the qualifying draw:
The following players received entry as lucky losers:
The following pairs received wildcards into the doubles main draw:
The following pair received entry from the qualifying draw: