This is a list of New Hampshire county name etymologies:
- Belknap County, New Hampshire: Belknap is named for Jeremy Belknap, an early New Hampshire historian.
- Carroll County, New Hampshire: Carroll is named for Charles Carroll of Carrollton, the last surviving signer of the Declaration of Independence.
- Cheshire County, New Hampshire: Cheshire is named for the English county of Cheshire.
- Coos County, New Hampshire: Coos is named for a Native American word meaning crooked, in reference to a bend in the Connecticut River.
- Grafton County, New Hampshire: Grafton is named for Augustus Henry Fitzroy, 3rd Duke of Grafton, a Prime Minister of Great Britain.
- Hillsborough County, New Hampshire: Hillsborough is named for Wills Hill, 1st Marquess of Downshire, known in America as the Earl of Hillsborough.
- Merrimack County, New Hampshire: Merrimack is named for the Merrimack River.
- Rockingham County, New Hampshire: Rockingham is named for Charles Watson-Wentworth, 2nd Marquess of Rockingham, a two-time Prime Minister of Great Britain.
- Strafford County, New Hampshire: Stafford is named for William Wentworth, 2nd Earl of Strafford.
- Sullivan County, New Hampshire: Sullivan is named for John Sullivan, the third and fifth governor of New Hampshire.
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