Singapore's multicultural society, defined by intersecting ethnic, linguistic, and religious traditions, offers a dynamic context for advancing culturally competent psychological assessment. As a densely urbanized and globally connected city-state, Singapore is shaped by the lived experiences of Chinese, Malay, Indian, and migrant communities. Psychological assessment must therefore address the diverse ways individuals interpret and express psychological distress. Rapid socio-economic development, educational shifts, and digital exposure have contributed to changing generational perspectives on mental health, increasing the demand for tools that are both linguistically accessible and culturally meaningful. This presentation examines culturally competent practices in psychological assessment in Singapore, with a focus on adapting and validating instruments for use across diverse linguistic and cultural groups. Examples include the local validation of the Center for Epidemiologic Studies Depression Scale (CES-D) among Chinese, Malay, and Indian populations, revealing differential symptom expression and varying prevalence rates of depression across ethnicities. The cross-cultural application of cognitive assessments, such as the Repeatable Battery for the Assessment of Neuropsychological Status (RBANS) and the Montreal Cognitive Assessment (MoCA), highlights the need to move beyond direct translation toward cultural adaptation that ensures semantic, conceptual, and criterion equivalence. Recent work adapting tools like the EQ-5D-Y for Singaporean youth demonstrates the value of involving expert panels and cognitive debriefing interviews to ensure language and concepts are locally relevant and developmentally appropriate. The presentation will outline best practices derived from local and international guidelines for cultural adaptation, including co-production with users, expert consultation, and rigorous content validation. The discussion will also address ethical imperatives, including fairness, inclusivity, and reducing diagnostic bias. Singapore's experiences offer valuable insights for ASEAN member states aiming to harmonize psychological measurement with local norms, advancing culturally competent practice across the region.