Objective: To compare and evaluate the prevalence of food and beverage marketing on the livestreaming platforms Twitch, Facebook Gaming, and YouTube Gaming, as well as examine growth of food and beverage marketing on these platforms over a 17-month period of data collection.Design: Cross-sectional data was analyzed across three livestreaming platforms and six food and beverage categories: alcohol, candy, energy drinks, snacks, sodas, and restaurants.Setting: Stream titles of livestreamed events as well as corresponding hours watched on Twitch, Facebook Gaming, and YouTube Gaming.Participants: NoneResults: There were significant differences between food and beverage brand mentions across all three studied platforms (p<0.05), as well as hours watched (p<0.05). Energy drinks dominated food and beverage brand mentions across platforms, followed by restaurants, soda, and snacks. All platforms demonstrated growth over the 17-month data collection period. Post-hoc analyses revealed that the COVID-19 pandemic impacted both immediate and sustained growth across all platforms, with the greatest impact observed on the Twitch platform.Conclusions: Food and beverage marketing as measured through stream titles is widely prevalent across the three most popular livestreaming platforms, particularly for energy drinks. Food marketing on these platforms experienced growth over the past 17-months which was accelerated substantially by the COVID-19 pandemic. Future work should assess the sustained impact this growth may have on marketing practices and eating behavior.