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.

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.

Most of Haldimand is agricultural land, although some heavy industry, including the former Nanticoke Generating Station, is located here.

Smaller communities within the municipality are Attercliffe Station, Balmoral, Bodri Bay, Brookers Bay, Byng, Canborough, Canfield, Cheapside, Clanbrassil, Crescent Bay, Decewsville, Empire Corners, Featherstone Point, Fisherville, Garnet, Hoover Point, Kohler, Little Buffalo, Lowbanks, Moulton Station, Mount Carmel, Mount Healy, Nanticoke, Nelles Corners, Peacock Point, Port Maitland, Rainham Centre, Selkirk, Sims Lock, South Cayuga, Springvale, Stromness, Sweets Corners, Townsend, Willow Grove, Woodlawn Park and York.

The ghost towns of Cook's Station, Cranston, Dufferin, Erie, Indiana, Lambs Corners, Lythmore, Sandusk, Upper, and Varency are also located within Haldimand.

Haldimand County's area of 309,300 acres was formed from part of the land grant to the Six Nations in 1783.

Several intercity bus companies operate routes that travel through Haldimand County, connecting it to nearby cities and towns.