Global retail media spending is poised for strong growth over the next five years and will exceed $300 billion by 2030, up from $184 billion in 2025. All regions will gain share at the expense of China. Onsite retail media will remain dominant, while offsite spending will more than double by 2030. Amazon will maintain its global lead, though Chinese online retailer Pinduoduo will emerge as a challenger. This report provides a five-year forecast for global retail media spending by region and category, along with market share data for the top five global players. The accompanying Excel includes actual data from 2022 to 2024 and Forrester’s forecasts from 2025 to 2030.