In this article, we contribute to this scholarship with an analysis of the effect of immigrant-related diversity on generalized and localized or community trust. As we will illustrate, Spain is a very interesting case study for testing the main theoretical propositions that relate diversity to decreasing levels of trust, and especially for testing whether these effects are visible in the short-term, as has been suggested by Putnam. In just a decade, the immigrant population multiplied by five, and many local communities became ethnically diverse. The rapidity and magnitude of this social change leads us to expect visible effects.Our contribution is twofold. Firstly, by analysing the effect of immigrationrelated diversity at the smallest level of aggregation possible in Spain -the census section level -we are able to adequately test the propositions that relate greater 3 ethnic diversity to residents' social trust. Secondly, we overcome the limitations intrinsic to the crude measurement of diversity of the Herfindahl index with a systematic consideration of multiple alternative indicators of immigration-related diversity that examine the effects of the national origin, linguistic, and racial diversity that has changed the social face of Spanish local communities throughout the country.With this thorough examination of diversity in an interesting and little-known case, we find no effect of diversity on generalized trust, and a negative impact on community trust. We also find that considering multiple dimensions of immigrationrelated diversity is a worthwhile pursuit, as our results suggest that certain types of immigrants engender a more negative reaction than others.The article proceeds as follows. In the next section we summarize the key issues discussed in the scholarly literature around this topic and we outline the empirical expectations that are derived from it. This is followed by a brief description of the Spanish case and of its relevance for the research questions addressed. The third section presents the data, variables and methods used. After that, we present the empirical results, and we conclude with a discussion of the main findings and implications.