Map - Haldimand County, Ontario (Haldimand County)

Haldimand County is a rural city-status single-tier municipality on the Niagara Peninsula in Southern Ontario, Canada, on the north shore of Lake Erie, and on the Grand River. Despite its name, it is no longer a county by definition, as all municipal services are handled by a single level of government. Municipal offices are located in Cayuga.

The county is adjacent to Norfolk County, the County of Brant, the City of Hamilton, and the Regional Municipality of Niagara.

Haldimand's history has been closely associated with that of neighbouring Norfolk County. Upper Canada was created in 1791 by being separated from the old Province of Quebec, Haldimand was created in 1798 as part of the Niagara District. It was named after Sir Frederick Haldimand, the governor of the Province of Quebec from 1778 to 1785. In 1844, the land was surrendered by the Six Nations to the Crown in an agreement that was signed by the vast majority of Chiefs in the Haldimand tract. From 1974 to 2000, Haldimand County and Norfolk County were merged to form the Regional Municipality of Haldimand-Norfolk. See Regional Municipality of Haldimand–Norfolk and Norfolk County History for the period when Haldimand and Norfolk were governed as a single unit.

Beginning in February 2006, a land dispute by native protesters began near Caledonia over a housing development being built on the outskirts of town, which members of the nearby Mohawk Six Nations people claim is rightfully their land.