In many Canadian provinces, a Department of Intergovernmental Affairs or a Ministry of Intergovernmental Affairs is a cabinet-level agency charged with relations between the province and other provinces, the federal government and, in some cases, foreign governments.
The federal government appoints a Minister of Intergovernmental Affairs, but this minister does not head an independent department, being instead a member of the Privy Council Office.
See also Department of Intergovernmental Affairs (New Brunswick) Ministry of Intergovernmental Affairs (Manitoba)