Connectedness to Nature represents the relationship of the Self with the natural environment and has been made operative using different scales. One of the most systematically studied in the Anglo-Saxon context has been the Mayer and Frantz (2004) Connectedness to Nature Scale (CNS). In an attempt to study the psychometric properties of this instrument in a Spanish-speaking context, two studies were conducted. In the first one, the internal consistency and convergent and discriminant validity were assessed with 135 university students and 112 inhabitants from Madrid. Based on factorial analyses of principal components and reliability results, small changes have been proposed to the original scale; this means that acceptable values of internal consistency can be reached. Moreover, as anticipated, the CNS correlated consistently with the Inclusion of Nature in Self scale and environmental beliefs. In the second study, test-retest reliability was evaluated and the convergent validity was assessed by comparing the CNS with the Environmental Identity Scale (EID). The results of internal consistency, as indicated by the data from 204 college students, were analogous to those obtained in the first study, besides of an adequate test-retest reliability of the CNS. A positive correlation between CNS and EID was also observed. Keywords: Connectedness; Anthropocentrism; Egobiocentrism; Environmental Identity.