The increased popularity of casino games on social media platforms has prompted international jurisdictions to consider the extent to which these games may be similar to Internet gambling activities and therefore subject to regulatory action. Gambling themes are popular in video and computer games, and simulated-gambling activities are commonly offered by gambling operators as a way of enticing users to gamble online with money. However, little research has evaluated the impact of the digital convergence of gambling and gaming. The lack of a clear definition of online gambling-themed activities to guide such research undertakings represents a significant hurdle to the fields of gambling and gaming. Based on a review of the extant literature, this article proposes a taxonomy to distinguish between many types of online activities with gambling-themed content. This taxonomy suggests that the principal features that differentiate online gambling games include the requirement for payment, the role of skill, the type of platform and the centrality of the gambling theme. The proposed hierarchical framework aims to promote clear and consistent discussion to guide ongoing investigation of new and emerging Internet gambling and gaming technologies.