The Mayor of Grey, often referred to as the Mayor of Greymouth, officiates over the Grey District of New Zealand which is administered by the Grey District Council with its seat in Greymouth. The current Mayor is Tania Gibson. Two predecessors to this office were the Mayor of Greymouth, officiating over the Greymouth Borough Council from 1868, and from 1877 the chairman of the Grey County Council.

Greymouth is the largest town in the West Coast region in the South Island of New Zealand, and the seat of the Grey District Council. The population of the whole Grey District is 14,250, which accounts for 43% of the West Coast's inhabitants. The Greymouth urban area had an estimated population of 8,340. A large proportion of the District, 65%, is part of the Conservation Estate owned and managed by the Department of Conservation making Greymouth a natural centre for walkers and trampers.