The aim of this study is to find out more about how the immigrant community is being integrated socio-linguistically into the city of Madrid. It takes as its premise that integration is a bi-directional process conditioned directly by the beliefs, values and attitudes of both the immigrant and the host communities (Moreno Fernández, Francisco. 2009. "Integración sociolingüística en contextos de inmigración: marco epistemológico para su estudio en España." Lengua y Migración / Language and Migration 1 (1): 121-156). At its different structural levels, the host community can be regarded as a glottopolitical agent which shapes and explains the attitudes and behaviour immigrants might adopt when resolving inter-group conflicts. We present here the preliminary results of a study of the sociolinguistic attitudes of Madrilenians living in the city of Madrid to the immigrant population within their community. Our aim is to explore how immigration is perceived by the host community and thereby to determine how that community is conditioning the process of social, and therefore linguistic, integration of the immigrant population, with particular attention to the role of language as a key component in that process.