A regional chair, referred to as the district chair in Muskoka District or the warden in Oxford County, is the head of council and chief executive officer of upper-tier municipalities (regional municipalities) in Ontario.

[1][2] Chairs elected by councillors in most regional municipalities.

The position is similar to the role of the mayor or reeve in lower- or single-tier municipalities.

In the former Metropolitan Toronto, now the amalgamated City of Toronto, the regional chair was called Metro Chairman.

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