Kastanofyto (Greek: Καστανόφυτο, before 1927: Οσνίτσανη – Osnitsani)[2] is a village and a community in Kastoria Regional Unit, Macedonia, Greece.

The village has a folklore museum.

In 1945, Greek Foreign Minister Ioannis Politis ordered the compilation of demographic data regarding the Prefecture of Kastoria.

[3] The village Kastanofyto had a total of 482 inhabitants, and was populated by 241 Slavophones without a Bulgarian national consciousness.

The village is in a major chestnut growing region and hosts a chestnut festival every October.