Tomás Barrón is a province in the northern parts of the Bolivian department of Oruro.
Tomás Barrón province is one of the sixteen provinces in the Oruro Department. It is located between 17ð 31' and 17ð 44' South and between 67ð 20' and 67ð 34' West. It has been named after Colonel Tomas Barrón.
The province borders La Paz Department in the North and West, and Cercado Province in the South and East.
The province extends over 30 km from North to South, and 25 km from East to West.
Main language of the province is Spanish, spoken by 87%, while 82% of the population speak Aymara and 8% Quechua (1992).
The province comprises only one municipality, Eucaliptus Municipality, which is identical to the Tomás Barrón Province.