Although intergroup attitudes are among the most pervasively studied topics in social psychological literature, empirical attention for inter-minority attitudes has hitherto remained rather scant. To address this notable lacuna, the central goal of the present proposal is to expand the underdeveloped inter-minority attitudes literature in three important ways. Firstly, we aim to improve the conceptualization and measurement of inter-minority attitudes held by ethnic-cultural minorities. To this end, we advance a novel methodology which combines a to-be-developed questionnaire to quantify general inter-minority bias with a more granular approach to assess preferences for specific minority groups. Preliminary pilot data confirm the applicability of the latter technique to assess inter-minority attitudes. A second objective of the present proposal is to investigate how inter-minority attitudes contribute to perceived social capital, a research question which has so far received virtually no scholarly attention. Thirdly, we intend to study if and how secondary transfer effects of inter-minority contact can ameliorate inter-minority attitudes (and hence, social capital). Taken together, the present proposal should advance our understanding of how inter-minority attitudes and social capital develop, thrive, and can further be promoted in modern “super-diverse” societies.