This chapter examines the phenomenon of corruption in the context of mega-sport events by setting a theoretical framework and presenting empirical data based on host population surveys. The surveys were conducted between 2014 and 2016 in Brazil, host country of the FIFA World Cup and the Olympic Games (Rio de Janeiro). The chapter investigates how organization-level and country-level corruption influences the host population’s perception of the event, the sport federations and the sponsors. Based on the results of our studies, we recommend several solutions and means to prevent and reduce corruption as the legacy of mega-sport events, such as enforcement of codes of conduct, higher accountability of institutions and corporate social responsibility.