Vitsi () is a former municipality in Kastoria regional unit, West Macedonia, Greece. Since the 2011 local government reform, it has been part of the municipality of Kastoria, of which it is a municipal unit. It takes its name from Mount Vitsi which is the highest point within the municipal unit. The municipal unit has an area of 135.028 km<sup>2</sup>. The population is 1,145 (2021). It includes the villages of Sidirochori (ãùô÷ÃÂÿÃÂÃÂÃÂù), Foteini (æÃÂÃÂõùýî), Metamorfosi (ÃÂõÃÂñüÃÂÃÂÃÂÃÂÃÂ÷), Toichio (äÿùÃÂùÃÂ), Vyssinia (ÃÂàÃÂÃÂùýùì), Oxya (ÃÂþàì), Polykerasos (àÿûàúÃÂÃÂñÃÂÿÃÂ) and Poimeniko (àÿùüõýùúÃÂ). The village of Poimeniko has no permanent residents anymore. The seat of the municipality was in Toichio.