The term Unicity refers to reforms in the structure of the metropolitan government of Winnipeg in 1972. Unicity, an ambitious experiment in local government reform, established the City of Winnipeg as one unified city; until that point, the greater Winnipeg area had been composed of several municipalities under a single metropolitan government, in a "two-tier" system.

The City of Winnipeg Act incorporated the rural municipalities of Charleswood, Fort Garry, North Kildonan, and Old Kildonan; the Town of Tuxedo, the cities of East Kildonan, West Kildonan, St. Vital, Transcona, St. Boniface, and St. James-Assiniboia; the City of Winnipeg and the Metropolitan Corporation of Greater Winnipeg into one city. The Unicity system replaced the two-tier metropolitan system established in 1960.

The Unicity reforms were originally proposed by the New Democratic Party (NDP) government elected in 1969. NDP's goals included greater citizen participation in government; "financial equity, the elimination of conflict and stalemate between the Metro and municipal levels, greater efficiency in the delivery of services, and a greater degree of involvement by the public at large in local politics". However, the Unicity reforms as actually enacted were far from those laid out in the NDP's original "White Paper" on the subject (Proposals for Urban Reorganization in the Greater Winnipeg Area, December 1970).