Tamasio

{{Infobox Greek Dimos

|name = Tamasio

|name_local = Ταμάσιο

|type = municipal unit

|image_map = DE Tamasiou.svg

|map_caption = Location within the regional unit

|periph = Thessaly

|periphunit = Karditsa

|municipality = Sofades

|population = 2421

|population_as_of = 2021

|area = 163.5

|elevation =

|coordinates = {{coord|39|12|N|22|08|E|format=dms|display=inline,title}}

|postal_code =

|area_code =

|licence = ΚΑ

|website =

|image_skyline =

|caption_skyline =

}}

Tamasio ({{langx|el|Ταμάσιο}}) is a former municipality in the Karditsa regional unit, Thessaly, Greece. Since the 2011 local government reform it is part of the municipality Sofades, of which it is a municipal unit.{{Cite web|url=http://www.et.gr/idocs-nph/search/pdfViewerForm.html?args=5C7QrtC22wGYK2xFpSwMnXdtvSoClrL81-32jgAMSfbnMRVjyfnPUeJInJ48_97uHrMts-zFzeyCiBSQOpYnT00MHhcXFRTsb2fGphpq4MKX2ZkaHobySNnvZCNHXvYVvlf80XevW0Q.|title=ΦΕΚ B 1292/2010, Kallikratis reform municipalities|language=el|publisher=Government Gazette}} The municipal unit has an area of 163.504 km².{{cite web|url=http://dlib.statistics.gr/Book/GRESYE_02_0101_00098%20.pdf|publisher=National Statistical Service of Greece|title=Population & housing census 2001 (incl. area and average elevation)|language=el}} Population 2,421 (2021). The seat of the municipality was in Leontari. The municipality was named after Mount Tamassion (Tamasion was also the old name of the village of Anavra).