School-based humanistic counseling (SBHC) is a widely delivered intervention for psychological distress in young people, particularly in the UK. This study piloted a set of procedures for evaluating SBHC and obtaining indications of effect. Psychologically distressed young people (aged 13-16) were randomized to either 12 weeks of SBHC or a waiting list control. The primary outcome was psychological distress at the 12-week endpoint, as measured by the Young Person's CORE. Those allocated to counseling (n=16) showed significantly greater reductions in psychological distress than participants in the control group (n=17), with an effect size (ES) (g) of 1.14 on the primary outcome and a mean ES across all four outcome measures of 0.73 at endpoint. The findings indicate that SBHC may be an effective means of reducing psychological distress in young people.