The goal was to compare three-factor and two-factor solutions and construct validity of the Adult Attachment in the Workplace (AAW) questionnaire. Participants were 660 volunteers from three countries (France, Italy, and Great Britain). The two-factor model of Neustadt, Chamorro-Premuzic, & Furnham (2006) and the three-factor theoretical model of Collins and Read (1990) were compared. Construct validity was assessed by calculating correlations among the two- and three-factor AAW, the Workplace Attachment Scale, and the Organizational Commitment Scale. The three-factor structure differentiated between the three attachment styles, i.e., secure, preoccupied, and avoidant. There were moderate, significant correlations between AAW, workplace attachment, and affective commitment. Confirmatory factor analysis indicated that the three-factor structure fit the data better. Furthermore, the AAW, the Workplace Attachment Scale, and the Organizational Commitment Scale can be considered independent. In line with previous empirical evidence, a further distinction is noted between avoidant and preoccupied styles in the workplace.