Nowy Harsz was formerly part of the German Empire. In the German Empire, the place was called Haarschen, Neu.
The place is now called Nowy Harsz and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Neu Haarszen | German Empire | Angerburg | 1936 |
| Haarschen, Neu | German Empire | Angerburg | 1939 |
| Nowy Harsz | Under Polish administration | Węgorzewo | 1945 |
| Nowy Harsz | Poland | Suwałki | 1992 |