| Type: | ATP Challenger |
| Lošinj Open | |
| Current: | 2021 Lošinj Open |
| Event Name: | Lošinj Open |
| Location: | Veli Lošinj, Croatia |
| Venue: | Ljubicic Tennis Academy |
| Category: | ATP Challenger Tour |
| Surface: | Clay |
| Draw: | 32S/32Q/16D |
The Lošinj Open is a professional tennis tournament played on outdoor clay courts. It is currently part of the ATP Challenger Tour. It is held annually in Lošinj, Croatia since 2021.[1]