Sociologists – and social scientists more broadly – have often resorted to ‘public sociology’ and ‘activist research’ (AvR) with the aim of producing useful knowledge for the common good and also supporting emancipatory social movements and progressive policies. I define AvR here as collective processes of cooperation between academic researchers and non-academics in order to benefit the latter. This approach bridges theory and practice in ways that enhance the consistency and legitimacy of sociology as an engaged science. Recent debates on public sociology, however, have overlooked the central role of AvR. To reverse this relative omission, I suggest a clear typology of AvR processes and practices that have been used and hold the potential to advance public sociology. I also contend that in contrast to views of AvR as a clearly demarcated method, it encompasses multiple research, collaborative and action techniques so that it may be better conceived of as a ‘methodological toolbox’.