Diaspora communities serve as transnational consumer groups whose identities are shaped by hybrid cultural affiliations, migration experiences, and multi-country economic ties. Intercultural marketing targets diaspora populations through culturally adapted messaging, heritage symbolism, and multi-market supply chains. This paper examines diaspora marketing across South Asian communities in the Gulf, African diaspora in North America, Chinese diaspora worldwide, and Arab diaspora in Europe. Using identity formation theory, acculturation models, and hypothetical dataset comparisons, the study evaluates branding strategies, digital engagement channels, remittance-linked ecosystems, and cultural authenticity expectations. Findings reveal that diaspora consumers require dual-identity messaging and trust-building mechanisms such as heritage representation, cross-border product availability, geographic sentiment, multilingual content, and policy awareness. A strategic framework for diaspora-focused marketing is proposed.