Treska is a river in the western part of the Republic of Macedonia, a right tributary to Vardar. It is long, and its basin is 2350 km².
It rises in the Stogovo mountain at an altitude of around 2000 meters, and flows eastwards through the valley of Kičevo. At Makedonski Brod it turns northwards, flows between the mountains of Suva Gora and Karadžica, finally flowing into the Vardar in the Skopje suburb Gjorče Petrov.
Three dams have been built on Treska:
- in 1937 the Matka dam and lake near Skopje
- in 2004 the Kozjak dam and lake
- in 201? the Sveta Petka