Montes de Oro is a canton in the Puntarenas province of Costa Rica.

Montes de Oro was created on 17 July 1915 by decree 42.

[1] Montes de Oro has an area of 244.76 km²[4] and a mean elevation of 370 metres.

[2] The mountainous canton lies in the Cordillera de Tilarán northeast of the city of Puntarenas.

The canton of Montes de Oro is subdivided into the following districts: For the 2011 census, Montes de Oro had a population of 12,950 inhabitants.