Building an Indigenous mental health workforce is a strategy used to develop culturally responsive and effective mental health services in New Zealand. However, researchers know little about Indigenous (Māori) mental health nursing. We undertook a Māori-centered methodology and grounded theory using focus groups to collect data from 10 Māori mental health nurses. We then analyzed the data using constant comparative analysis and theoretical sampling until saturation of the core category and subcategories emerged. "Bridging two worlds," together with two subcategories, "going beyond" and "practicing differently," explains the process Māori mental health nurses used to resolve the tensions they encountered working in the worlds of mainstream and Māori health services. This research provides insight into the tensions Indigenous and minority nurses experience when attempting to integrate cultural perspectives and practices to meet the needs of their patients.