Gender-based violence (GBV) constitutes a pervasive human rights and public health concern with profound consequences for children who witness or experience violence within their homes and communities. While quantitative studies documented anxiety, depression, trauma symptoms, and academic decline among GBV-exposed children, the perspectives of counselling psychologists remained underexplored in Zimbabwe. This qualitative study explored how counselling psychologists understood and responded to the psychological effects of GBV on children in Midlands Province, Zimbabwe. Grounded in Bronfenbrenner's (1979) ecological systems theory and interpretivism, the study employed an exploratory case study design. A purposive sample of 15 counselling psychologists was selected, and data were collected through semi-structured interviews. Reflexive thematic analysis following Braun and Clarke's (2023) six-phase framework was used to analyse the data. Trustworthiness was ensured through member checking, audit trail, and peer debriefing, while ethical considerations including informed consent, confidentiality, and distress protocols were strictly observed. The findings revealed two broad themes. First, counselling psychologists described the psychological effects of GBV on children as encompassing emotional and affective distress (fear, anxiety, sadness, depression, anger, and helplessness), behavioural and social dysfunction (aggression, withdrawal, anti-social behaviour, and difficulty trusting others), and cognitive and academic impairment (poor concentration, memory problems, declining grades, and school dropout). Second, intervention strategies included trauma-informed therapeutic approaches (play therapy and cognitive behavioural techniques), culturally adapted interventions (family involvement, indigenous language use, and cultural practices such as storytelling and music), and multidisciplinary collaboration (working with social workers, teachers, and police). However, systemic challenges including limited human resources, financial barriers, and cultural norms that discouraged disclosure significantly constrained intervention effectiveness. The study concluded that GBV profoundly compromised children's emotional, behavioural, cognitive, and academic functioning, and that while counselling psychologists employed relevant interventions, systemic barriers limited their reach and impact. The study recommended that counselling psychologists integrate trauma-informed, developmentally appropriate, and culturally adapted interventions into routine practice; policymakers allocate adequate resources to expand mental health services in Midlands Province; researchers conduct further qualitative and longitudinal studies; and schools and mental health practitioners establish formal multidisciplinary collaboration frameworks to strengthen early identification and coordinated responses for GBV-affected children.