Cities in Southeast Asia are rapidly changing as they must accommodate larger populations, and their residents are becoming wealthier. Such changes may have impacts on urban green spaces and the ecosystem services that they provide. To assess the potential impacts of future urbanisation in the region, we analysed existing relationships between city size, wealth, and population density, and (1) the percentage cover of green space, (2) the quantity of green space per capita, and (3) the aggregation of green space. We used remote sensing analysis of Landsat 7 data to classify green space in 111 urban areas in Southeast Asia.