| Conventional Long Name: | Cumberland County |
| Subdivision: | County |
| Nation: | Vermont Republic |
| Year Start: | 1778 |
| Year End: | 1781 |
| Event Start: | Establishment |
| Date Start: | 17 March |
| Event End: | Partition into smaller counties |
| Membership Title1: | Country |
| Membership1: | Vermont Republic |
| P1: | Cumberland County, New YorkCumberland County |
| P2: | Gloucester County, New YorkGloucester County |
| S1: | Orange County, VermontOrange County |
| S2: | Windham County, VermontWindham County |
| S3: | Windsor County, VermontWindsor County |
| Today: |  United States |
The Cumberland County, until 21 March 1778, known as the Unity County,[1] was a county in Vermont Republic. It was established on 17 March 1778, being formed from the counties of Cumberland and Gloucester from the state of New York, United States, that were acquired by Vermont. It existed until 1781, when it got partitioned into three other counties: Orange, Windham, and Windsor.[2]