This study deals with the uncertainty in defining behavioral addictions (BAs). BAs are characterized by specific compulsive behaviors, regardless of potential negative consequences. However, to differentiate a behavior from a leisure activity to an addictive one is still an object of debate in the literature. Accordingly, this study aimed to assess the psychometric properties of the Behavioral Addictions Questionnaire (BAQ) as a possible screening tool for multiple BAs (i.e., shopping, food addiction, gambling, sex, work, exercise, Internet, videogames, and smartphone). BAQ aims to give a dimensional and quantitative assessment of addictive behaviors in a continuum, including both the adaptive and maladaptive features of the behaviors. Five hundred and seventy-six healthy adults (age range: 18–88) participated in the study, completing a survey including the BAQ questionnaire. Considering both exploratory and confirmatory factor analyses, statistical examination suggested good psychometric properties, with adequate validity in all its subscales (i.e., the goodness of fit). Moreover, also higher reliability was confirmed for each dimension detected (i.e., all alpha over 0.65). The BAQ represents a comprehensive screening instrument that benefits from appropriate validity and reliability for assessing BAs. Therefore, it can be used in clinical fields and research. Moreover, the feature of BAs on a continuum, and the severity index adopted by the study, can help from a preventive perspective. However, further validation of the BAQ is needed in other countries and contexts.