Sports tourism involves traveling with the purpose of participating in or observing sports events or activities. This can encompass a diverse range of experiences, such as attending major sporting competitions like the Olympic Games or FIFA World Cup, competing in sports tournaments or events, or engaging in adventure sports such as skiing, surfing, or mountain biking. Additionally, sports tourism can involve visiting sports-themed sites like museums, stadiums, or training facilities, as well as going on sports-related tours or vacations. Over time, sports tourism has become increasingly popular, with a growing number of people traveling domestically and internationally to engage in or watch sports events. For a host country, hosting the FIFA World Cup can represent a significant milestone and a symbol of achievement. The World Cup is the most prestigious and widely viewed sporting event in the world, with millions of people watching from all corners of the globe. The success of big sports events largely depends on the quality and quantity of human resources, including volunteers. In this study, we explore the effect of diversity of volunteers on the success of big sports events. We argue that a diverse group of volunteers can bring different perspectives, skills, and experiences that can contribute to the overall success of the event. To test our hypothesis, we conducted a content analysis of official websites which covered FIFA World Cup 2022 in Qatar. The study collected data on the demographic characteristics of the volunteers, their motivation to participate, their perceptions of diversity, and their evaluation of the event's success. Our findings suggest that the diversity of volunteers positively affects the success of big sports events. Specifically, volunteers who perceive higher levels of diversity in terms of race, ethnicity, age, and gender are more likely to evaluate the event as successful. Furthermore, our analysis shows that diversity is more important for certain functions, such as customer service and translation, than others. Our study contributes to the literature on diversity and volunteerism and has practical implications for the management of big sports events. Our findings suggest that event organizers should strive to recruit a diverse group of volunteers and create an inclusive environment that values and leverages their differences.