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Objective: Binge Eating Disorder (BED) has recently been included in the DSM-5. Like many other eating disorder symptoms, BED is often present in adolescence. No studies have specifically investigated the influence of impulsivity and alexithymia on the emotional-behavioural functioning of adolescents diagnosed with BED. Method: In this study, we recruited N = 162 adolescents (age range: 14-18) and divided them into two groups: 78 adolescents diagnosed with BED, according to the DSM-5 criteria (Group A), and 84 healthy controls (Group B). Participants completed the Youth Self-Report (YSR/11-18), the Toronto Alexithymia Scale (TAS-20) and the Barratt Impulsiveness Scale (BIS-11). Results: The results showed that Group A had higher scores of alexithymia, impulsivity and maladaptive emotionalbehavioural functioning than Group B. Furthermore, alexithymia had a mediating effect on the relationship between impulsivity and emotional-behavioural functioning. Conclusions: These results allow us to hypothesise that alexithymia is a key variable influencing the emotional and behavioural problems of adolescents affected by BED. Our data confirms the previous studies underlining the association of impulsivity and alexithymia with the diagnosis of BED in adolescents, and our study contributes to the previous literature, emphasising the central role of alexithymia in the mediating effect between impulsivity and emotional and behavioural problems. These results suggest the importance of promoting prevention and treatment polices focused on alexithymia. [ABSTRACT FROM AUTHOR]