Viseu is a municipality in Portugal.
Viseu or Vișeu may also refer to:
- Vișeu, a tributary of the river Tisza in northern Romania
- Viseu, Pará, a municipality in Pará, Brazil
- Vișeu de Jos, a commune in Maramureș County, Romania
- Vișeu de Sus, a town in Maramureș County, Romania
- Viseu Airport, in Viseu, Portugal
- Viseu District, a district in the Northern and Centro regions of Portugal
- Viseu 2001, a sports club in Viseu, Portugal