Siatista is a town located in the Kozani regional unit of Western Macedonia, Greece. Situated approximately 28 kilometres southwest of Kozani, it was constructed on the austral slope of the Velia mountain at an average height of 930 metres.
Following the 2011 local government reform, Siatista became a municipal unit and the seat of the municipality of Voio. The municipal unit covers an area of 158.524 km², while the community encompasses 94.426 km². According to the 2021 Greek census, the town has a population of 5,057 residents, with the broader municipal unit totaling 5,645 residents.