New information and communication technologies (ICTs) increasingly enable social action and civic organisation, on both local and global scales. Ranging from social media platforms such as Facebook and Twitter, to mobile apps such as Buycott, and to data sharing wiki platforms and hacktivist projects, the activist landscape is rapidly shifting, collapsing geographic boundaries to form new issue publics and fast, sometimes mercurial, collective action. Within these emerging digital platforms for activism, food-related consumer action is gaining new contours and publics. In this paper, we explore the emerging field of digital food activism. Focusing on three case studies – a mobile app, a wiki platform, and an online-centric activist organization – we examine how activist–ICT interactions generate new knowledges and practices in relation to consumer-based food activism. Specifically, we critically analyse how consumer activists and social entrepreneurs use ICTs to facilitate new or alternative forms of engagement with food, and how ICTs, in turn, shape possibilities for action. Bridging anthropology and science and technology studies, our paper develops new understandings of alternative food networks, social movements, activist leadership, and expertise in the digital age.