From frontline direct action to collective care strategies, Do-It-Yourself culture is a core element in grassroots activist communities. This PhD thesis explores the creative manifestations of DIY ethos in activist culture and practice across select regions in three countries: Australia, Indonesia, and the Philippines. Using a cross-cultural analysis between the three countries, this research seeks to understand how DIY is used to empower local communities, wield resistance, and circumvent the restrictions of a global pandemic. This thesis offers a novel contribution to the field of social movement studies as it probes the multi-faceted connection between DIY ethos and activist culture, which is largely missing from the literature on activism in this field. It also places three countries in dialogue with one another on a range of important issues, such as digital literacy, gender inequality, accessibility, and strategies of collective care. [...]