The purpose of this pilot study was to evaluate the feasibility of Internet-based CBT-E (ICBT-E) and to investigate whether participation in ICBT-E was associated with symptom reduction for patients suffering from full or subthreshold Bulimia Nervosa (BN) or Binge Eating Disorder (BED). ICBT-E targets key maintaining factors in Eating Disorders (ED) by introducing healthy eating patterns and addressing over-evaluation of weight and shape. The treatment consists of five modules which by large correspond to the four stages in CBT-E and was delivered mainly by means of internet and online communication, spanning over 12-15 weeks. All patients seeking treatment at the Stockholm Centre for Eating Disorders meeting the inclusion criteria were offered participation in the study, until a total 26 individuals were recruited. The results indicate that ICBT-E is a feasible and potentially promising treatment for full or subthreshold BN or BED. Participation in ICBT-E was associated with significant symptom reductions in core ED symptomology, funcional impairment as well as depressive symtoms, and the results were maintained at the 3-month follow-up. Although this pilot study showcased the encouraging potential of ICBT-E which marks a step forward in the endeavor to make powerful, empirically supported psychological interventions that target ED more widely available and accessible, there are several limitations and areas that should be adressed in future research.