Difficulties with emotion regulation have been identified as an underlying mechanism in mental health. This pilot study aimed at examining whether group skills training in emotion regulation for adolescents and parents as an add-on intervention was feasible in an outpatient child and adolescent psychiatric clinic. We also investigated if the treatment increased knowledge and awareness of emotions and their functions, increased emotion regulation skills and decreased self-reported symptoms of anxiety and depression. Six skills training groups were piloted with a total of 20 adolescents and 21 adults. The treatment consisted of five sessions dealing with psychoeducation about emotions and emotion regulation skills training. Paired-samples t test was used to compare differences between before-and-after measures for adolescents and parents separately. The primary outcome measure, Difficulties in Emotion Regulation Scale, showed significant improvement after treatment for both adolescents and parents. For adolescents, measures of alexithymia were significantly reduced. Also, emotional awareness was significantly increased. Measures of depression and anxiety did not change. In conclusion, group skills training as an add-on treatment can be feasible and effective but further studies are needed.