In New Zealand, people receiving care from specialist mental health and addiction services experience poorer health outcomes compared to the general population. Māori (Indigenous) specialist mental health and addiction service users experience disproportionate inequities. This study aims to: (1) Describe and understand mental health staff perspectives on the quality of care delivered to specialist mental health and addiction service users in their service – including specifically for Māori; and (2) Identify areas staff report as opportunities for quality improvement. In 2020, Southern District Health Board (now Te Whatu Ora – Southern) mental health staff were invited to participate in a cross‐sectional study assessing their perceptions of a range of service aspects. This paper presents quantitative and qualitative analyses about quality of care. Among the 319 staff who completed the questionnaire; 272 provided quality‐of‐care responses. Among these, 78% reported the quality of care delivered to service users as ‘good’ or ‘excellent’; only 60% reported this for Māori service users. Participants identified individual, service and broader system level factors influencing the quality of care delivered to service users, including factors specific for Māori. This study has identified, for what appears to be the first time, empirical and concerning differences in staff ratings of the quality of care delivered to Māori and SMHAS users overall. Findings highlight the need for institutional and managerial prioritization of hauora Māori, and incorporating tikanga Māori and Te Tiriti into practice.