Meeting the health needs of migrant and refugee communities is crucial to successful settlement and integration. These communities are often under-served by mental health services. Previous research has demonstrated the effectiveness of a group mindfulness-based intervention tailored for Arabic and Bangla speakers living in Sydney, Australia. This study aimed to explore community partner perspectives on the program’s impact, contributing factors and sustainability, and to elicit suggestions for future development. Data were collected via semi-structured telephone interviews with a purposively selected sample of 16 informants. Thematic analysis was conducted using the Rigorous and Accelerated Data Reduction (RADaR) technique. Community partners welcomed the emphasis on promoting wellbeing and reported that the community-based in-language intervention, in both face-to-face and online formats, overcame many of the barriers to timely mental health care for culturally and linguistically diverse (CALD) communities, with a beneficial impact on group participants, program providers, partner organisations and the broader community. Positive outcomes led to stronger community engagement and demand for more programs. For group mental health programs, both trust and safety are necessary. Relationships must be nurtured, diversity within CALD communities recognised, and projects adequately resourced to ensure partner organisations are not overburdened.