Objective: Boredom has been defined as "the aversive experience of wanting, but being unable to engage in satisfying activity". It is associated with a number of psychosocial and psychopathological problems. The aim of this paper is to test the validity of the Italian version of the Multidimendional State Boredom Scale (MSBS). The results of this investigation indicate that the Italian MSBS has factor structure that is similar to the original MSBS. Furthermore, there is evidence that the Italian MSBS has strong reliability. Method: In total, 690 undergraduate students participated in this research. Participants were 51.3% male, and 48.7% female, with a mean age of 24 years (SD = 4.92, range: 18-50 years). Two studies were conducted. In the first study, a confirmatory factor analysis was performed to determine whether data from the Italian MSBS fit the original MSBS factor structure. In the second study, the association between the Italian version of the MSBS and several related measures was examined. These related measures are: The Boredom Proneness Scale; The Dissociative Experiences Scale-II; Beck Depression Inventory-II; Beck Anxiety Inventory; The Eysenck Personality Questionnaire-Short Version; The Behavioural Inhibition System and Behavioural Activation System. Results: Study 1 found that the Italian translation of the MSBS, administered in an Italian-speaking sample, yielded the same factor structure as the original MSBS. Study 2 found that the Italian MSBS demonstrated construct validity in an Italian sample. Conclusions: The results of the present paper demonstrate that the Italian version of the MSBS is both valid and reliable. Study 1 found that the Italian MSBS has a similar factor structure to the original English MSBS, that the Italian MSBS's factors are significantly associated with one another, and that the Italian MSBS has good reliability. Study 2 demonstrated that the MSBS is valid, as it was related to a number of theoretically important constructs.