Alexithymia has been linked to reduced emotional awareness and increased aggression. One line of evidence suggests that authoritarian parenting contributes to the development of alexithymia. To elucidate the relationship between experienced parenting style, alexithymia and aggression the Parental Authority Questionnaire, the Toronto Alexithymia Scale and the Buss–Perry Aggression Questionnaire were administered to a group of emerging adults. Current findings show a positive relationship between: (i) authoritarian parenting style and alexithymia, (ii) alexithymia and aggression, iii) authoritarian parenting style and aggression. This study also found that paternal authoritarian parenting predicted alexithymia and aggression when controlling for maternal authoritarian style, but not the other way round. In addition, alexithymia mediated the relationship between paternal authoritarian parenting and aggression when controlling for maternal authoritarian style suggesting that elevated alexithymia which is likely to be a consequence of authoritarian parenting, especially when it is practiced by a father, contributes to increased aggression in adulthood.