The Metcalfe Fair is an agricultural fair held in the village of Metcalfe, a community located in the southern part of the City of Ottawa, Ontario. This fair has been held annually since 1856.

It first began in the communities south and east of the newly founded town of Ottawa in the Province of Canada, eleven years before Canadian Confederation in 1867.
The County of Russell Agricultural Society was formed in 1856 for the purpose of presenting an Agricultural Fair in September. Originally intended to rotate annually in the Townships of Gloucester, Osgoode, Russell, and Cumberland, the fair found a permanent home in the Village of Metcalfe in 1861.  In 1912, the year the Titanic sank, the County of Russell Agricultural Society changed its name to the Metcalfe Agricultural Society.

Today, Metcalfe Fair is a thriving major agricultural fair in Eastern Ontario.