AbstractIntroductionThis research explored the views of staff in secondary schools on school counselling for young people. Data were drawn from the Effectiveness and Cost Effectiveness Trial of Humanistic Counselling in Schools (ETHOS) study, an RCT of school counselling across 18 state‐funded secondary schools in London.MethodsQualitative semi‐structured interviews were held with school staff (n = 16) from a sub‐sample of 10 participating schools from the RCT. The interviews explored the perceived impact of school counselling on the school and students. Thematic analysis was conducted using the NVivo qualitative data analysis software.ResultsThree key themes were identified: (1) school context: rising mental health need and varying provision for mental health; (2) school staff perspectives on the impact of counselling: increased openness and improvements in mood, dedicated space to open up, putting skills into practice, one size does not fit all, and role of personal connection; and (3) long‐term impact of counselling in schools: integration as central to success and counselling as a stepping stone for further support.ConclusionThis research provides insights into school staff views of secondary school counselling in the context of delivery through a research trial. Effective ways of integrating counselling services into schools are identified.