Flag of Caernarfonshire
| Proportion | 3:5 |
|---|---|
| Adopted | March 2012 |
| Design | Vert, three eagles displayed in fess Or |
| Designed by | Historic |
The Caernarfonshire flag (Welsh: Baner Sir Gaernarfon) is the flag of the historic Welsh county of Caernarfonshire. The origins of the emblem of the three eagles arranged in fess on a green field revolve around the ancient King of Gwynedd, Owain Gwynedd, to whom the symbol was attributed as his coat of arms. It was registered with the Flag Institute in March 2012.