is a German surname with representation in New York State by the early 1700s.
Fort Klock, in the Mohawk Valley of New York State was built in 1750 by a Johannes Klock and was designated a National Historic Landmark in 1973.
Prominent individuals named Klock include:
- Fredrik Klock, a Norwegian footballer,
- Jacob Klock, Colonel in the Tryon County militia during the American Revolution,
- James Klock, a Canadian politician,
- James D. Klock, a retired US Navy Veteran
- Joseph P. Klock, a South Florida lawyer,
- Lori V. Klock, of societe du quatorze juillet.
- Vincent T. Klock, Youth sports coach, US Navy Veteran, son of James D.