Agios Vlasios (Greek: Άγιος Βλάσιος meaning Saint Blaise, before 1927: Καραμπάσι - Karampasi,[2] Turkish: Karabaş "black head") is a village and a community in the municipal unit of Artemida, Magnesia, Greece.

Agios Vlasios is situated on the slopes of mount Pelion, 1.5 km west of Agios Georgios Nileias, 2 km northeast of Ano Lechonia and 11 km east of Volos.

The community Agios Vlasios consists of the following villages:[1] During the Turkish Era, the village Palaiokastro which is located between Ano Lechonia and Agios Vlasios was inhabited by Turks.

After Thessaly joined Greece in 1881 Agios Vlasios (then Karampasi) became a part of the municipality of Nileia.

In 1997, Agios Vlasios became a part of the municipality of Artemida which has its seat at nearby Ano Lechonia.