Tourism businesses participate in network relationships with others to obtain resources that are unavailable within. Due to the socially embedded nature of interorganizational relationships, the social networks of the boundary-spanning personnel in tourism businesses are believed to have a profound influence on the formation and structure of their networks at the organizational level. Understanding the boundary-spanning personnel’s social network, particularly in a professional context, may facilitate tourism businesses in their human resources strategies and further benefit their business network development and maintenance. Using the Big-Five personality construct, this study investigated the personality effects on the tourism boundary-spanning personnel’s social network diversity and tie strength in a professional setting. The study revealed the connections between different aspects of individuals’ social networks and their personality traits. The findings indicated that, with different business networking needs or being at different network development stages, tourism businesses may need to look for employees with different personalities to undertake the corresponding networking tasks.