Cognitive behavioural therapy (CBT) is considered a frontline treatment for major depressive disorder (MDD) and is recommended as a preferred option in many Western healthcare settings. CBT has proven effective for clients from the majority population in Western countries, but to meet the needs of diverse clients it may require adaptation. The benefits of culturally adapted group CBT (CA-GCBT) for clients from diverse backgrounds remains uncertain. The objective of this review is to systematically identify, evaluate, and integrate the existing empirical literature on CA-GCBT for depressed clients from diverse backgrounds. A comprehensive search was conducted in April 2021 across various databases, including, MEDLINE, PsycINFO, Cinahl, Academic Search, and APA PsycArticle. Quantitative studies meeting the inclusion criteria resulted in a total of ten articles being included in the review. Results from the analysis revealed a statistically significant reduction in depressive symptoms following CA–GCBT in nine out of the ten studies, with one study providing descriptive results. Additionally, improvements were observed in dysfunctional beliefs, functioning, and quality of life ratings. These findings suggest promising outcomes for racially minoritised clients in Western countries and racial majority clients in non-Western countries. Adaptations in CA-GCBT primarily focus on modifying the group delivery, therapy content, staffing, processes, and client-specific factors. Overall, CA-GCBT shows promise as a treatment for depressed clients from diverse backgrounds. However, further evaluation is necessary to establish its efficacy in clinical practice more robustly, to identify which adaptations are most effective for specific populations and to explore the experiences of implementing or attending such group interventions.

1. (1) To explore the benefits of CA-GCBT for depressed clients from diverse backgrounds. Although CBT is a frontline treatment for MDD and often delivered in group format, it remains unclear whether CA-GCBT is beneficial.

2. (2) To summarise findings about the benefits of CA-GCBT for racially minoritised clients in Western countries and racial majority clients in non-Western countries.

3. (3) To outline the modifications made to common CBT group approaches to enhance cultural responsiveness for clients from diverse backgrounds.

4. (4) To provide support to therapists, healthcare services, and broader healthcare structures seeking to implement evidence-based knowledge when adapting group CBT for diverse cultural groups. This enables them to modify existing group CBT protocols or consider specific CA-GCBT interventions.