Frederic Williams Hopkins (September 15, 1806 – January 21, 1874) was a Vermont lawyer and militia officer who served as Adjutant General of the Vermont Militia.

Sir Frederic Calland Williams, CBE FRS (26 June 1911 – 11 August 1977), known as F.C. Williams or Freddie Williams, was an English engineer, a pioneer in radar and computer technology.

Lieutenant Peter Frederick Haldimand (1741 or 1742 in Switzerland – 16 December 1765 off Cape Breton ) was a military officer and surveyor in the British Army.