| Coat of arms of Leinster | |
|---|---|
 | |
| Versions | |
 The banner of arms, which serves as provincial flag | |
| Armiger | Leinster |
| Shield | Vert, a Harp Or, stringed Argent |
The flag of the Irish province of Leinster is a banner with the provincial coat of arms: a gold Irish harp with silver strings on a green field (blazon: vert a harp or stringed argent). These arms are similar to the arms of Ireland, which have the same device on a field of blue rather than green.
The arms (Vert, a Harp Or, stringed Argent) is believed to have likely evolved from the arms of Ireland itself with a change of tincture.