| Herb: | Księżyc |
| Battlecry: | - |
| Alternative: | - |
| Mention: | unknown |
| Families: | Wietecki, Wiecki, Szumlinski |
| Towns: | none |
Księżyc (Polish for "Moon") is a Polish coat of arms. It was used by several szlachta (noble) families under the Polish–Lithuanian Commonwealth.
Notable bearers of this coat of arms have included: