St Agnes (Cornish: Breanek)[1] is an electoral division of Cornwall in the United Kingdom and returns one member to sit on Cornwall Council.

The current Councillor is Pete Mitchell, a Liberal Democrat.

[2] Under its former boundaries, St Agnes represented the villages of St Agnes, Mithian and Trevellas, and the hamlets of Goonvrea and Goonbell.

The village of Blackwater was also mostly covered, with the rest being covered by the Chacewater, Kenwyn and Baldhu division.

[3][4] With its current boundaries, the division represents the villages of St Agnes, Porthtowan and Mount Hawke, and the hamlets of Goonvrea, Goonbell, Banns and Menagissey.