Voronoi or Voronoy is a Slavic masculine surname; its feminine counterpart is Voronaya. It may refer to
- Georgy Voronoy (1868–1908), Russian and Ukrainian mathematician
- Voronoi diagram
- Weighted Voronoi diagram
- Voronoi deformation density
- Voronoi formula
- Voronoi pole
- Centroidal Voronoi tessellation