Oreamuno is a canton in the Cartago province of Costa Rica. The head city is in San Rafael district.
Oreamuno was created on 17 August 1914 by decree 68.
Oreamuno has an area of and a mean elevation of metres.
The canton extends from its suburban head city of San Rafael northward into the Cordillera Central (Central Mountain Range). Irazú Volcano looms large in the northern reaches of the canton.
The canton of Oreamuno is subdivided into the following districts:
For the 2011 census, Oreamuno had a population of inhabitants.
The canton is covered by the following road routes:
The Interurbano Line operated by Incofer goes through this canton.