Haliburton—Kawartha Lakes—Brock is a provincial electoral district in Ontario, Canada, represented in the Legislative Assembly since 1999.

The district covers a large rural area including the City of Kawartha Lakes, Haliburton County, Brock Township, and surrounding communities. Known for its lakes, forests, and tourism, it is a mix of small towns, agricultural areas, and seasonal cottage country.

Since its creation, the riding has been part of electoral redistribution efforts to balance representation across Ontario. It plays an important role in representing the voices of central and rural Ontarians in provincial decision-making.