Intercultural marriages are increasingly common in Nigeria, a nation rich in ethnic, linguistic, and religious diversity. These unions often involve complex processes of cultural negotiation, identity adaptation, and psychosocial adjustment. This study explored the lived experiences of Nigerian couples in intercultural marriages, focusing on their psychological adjustment, interpersonal dynamics, and coping strategies. Using a phenomenological approach, in-depth semi-structured interviews were conducted with 15 couples (30 individuals) from diverse ethnic and religious backgrounds across Nigeria. Thematic analysis revealed key challenges, including identity conflict, familial disapproval, inter-religious tensions, and societal judgement. However, participants also demonstrated resilience through cultural compromise, spiritual practices, social support, and shared values. Findings highlight the deep interplay between culture and psychological well-being, revealing how intercultural couples in Nigeria negotiate and reconcile their diverse backgrounds to build resilient unions. The study offers insights for psychologists, marriage counselors, and policymakers seeking culturally sensitive interventions that promote marital harmony in pluralistic societies.