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.
General James Abercromby commissioned him as an ensign in the Royal American Regiment.
After being promoted to lieutenant, Haldimand was assigned to do surveying and historical work, drawing up maps of Canada and writing histories of Montreal and Trois-Rivières, as well as getting details on their governance.
At the end of the war, Haldimand was charged with assisting Captain Samuel Holland in his survey of the northern district of British North America.
Holland praised Haldimand's work, describing him as both an excellent mathematician and astronomer.