Evidence-based descriptions of culturally competent psychiatric nursing care are scarce. This study explored the perceptions of clients with mental illness regarding the overall effectiveness of psychiatric nursing care in meeting their cultural needs, and psychiatric nurses' perceptions of how and to what extent they provided culturally competent psychiatric mental health nursing care to diverse client populations. This descriptive study employed a qualitative research design using a multi-method data collection approach consisting of in-depth individual client interviews and a self-administered nurse questionnaire. Client participants tended to minimize the importance of receiving care related to their cultural needs. They described (1) encouraging and reassuring me; (2) speaking up for me; and (3) praying a lot as essential to their care. Nurse participants perceived their psychiatric nursing care to be culturally competent; however, few described specific strategies for incorporating cultural beliefs and practices into nursing care. Client participant lacked awareness of their cultural needs and had difficulty identifying and describing specific nursing interventions that contributed to positive mental health outcomes. Nurses perceived that they provided culturally competent care but actually lacked specific knowledge and skills to do so effectively.