The aim of the study is to explore the feasibility and initial outcomes of a mindfulness-based group intervention (MBI) for adolescents with inflammatory bowel disease (IBD). A mixed-methods uncontrolled study using an adapted 8-week group MBI for adolescents with IBD was conducted at a pediatric tertiary hospital. Primary outcomes focused on feasibility. Secondary outcomes focused on preliminary efficacy via quality of life, mindfulness, and symptoms of anxiety and depression. Of a total of 44 adolescents invited to participate, 16 adolescents completed the study. Group attendance and home meditation practice was satisfactory. There were significant differences in emotional functioning relative to IBD following MBI-A participation. Qualitative analysis rendered two themes: (1) personal interpretation and application of mindfulness and (2) the benefits of IBD-specific peer support. Several key adaptations are needed to increase feasibility of group MBIs prior to randomized controlled trials. Findings can be generalized to inform group-based therapies for adolescents with IBD.