We describe the development of a theory of change for Background: community mobilisation activities to prevent violence against women and girls. These activities are part of a broader program in urban India that works toward primary, secondary, and tertiary prevention of violence and includes crisis response and counselling and medical, police, and legal assistance.The theory of change was developed in five phases, via expert Methods: workshops, use of primary data, recurrent team meetings, adjustment at further meetings and workshops, and a review of published theories.The theory summarises inputs for primary and secondary Results: prevention, consequent changes (positive and negative), and outcomes. It is fully adapted to the program context, was designed through an extended consultative process, emphasises secondary prevention as a pathway to primary prevention, and integrates community activism with referral and counselling interventions.The theory specifies testable causal pathways to impact and Conclusions: will be evaluated in a controlled trial. How to cite this article: et al. A theory of change for community interventions to prevent domestic Wellcome Open Research violence against women and girls in Mumbai, India [version 1; peer review: 2 approved with reservations] 2019, :54 ( ) 4 https://doi.54 ( ) First published: 4 https://doi.org/10.12688/wellcomeopenres.15128.1 References Abramsky T, Devries K, Kiss L, et al.: Findings from the SASA! Study: a cluster randomized controlled trial to assess the impact of a community mobilization intervention to prevent violence against women and reduce HIV risk in Kampala, Uganda. BMC Med. 2014; 12: 122. PubMed Abstract | Publisher Full Text | Free Full Text Abramsky T, Devries KM, Michau L, et al.: Ecological pathways to prevention: How does the SASA! community mobilisation model work to prevent physical intimate partner violence against women? BMC Public Health. 2016; 16: 339. PubMed Abstract | Publisher Full Text | Free Full Text Archibald T, Sharrock G, Buckley J, et al.: Assumptions, conjectures, and other miracles: The application of evaluative thinking to theory of change models in community development. Eval Program Plann. 2016; 59: 119-127. PubMed Abstract | Publisher Full Text Auspos P, Kubisch AC: Building knowledge about community change: moving beyond evaluations. New York, NY, Aspen Institute Roundtable on Community Change. 2004. Reference Source Birckmayer JD, Weiss CH: Theory-based evaluation in practice. what do we learn? Eval Rev. 2000; 24(4): 407-431. PubMed Abstract | Publisher Full Text Bonell C, Jamal F, Melendez-Torres GJ, et al.: 'Dark logic': theorising the harmful consequences of public health interventions. J Epidemiol Community Health. 2015; 69(1): 95-98. PubMed Abstract | Publisher Full Text Bonell C, Melendez-Torres GJ, Quilley S: The potential role for sociologists in designing RCTs and of RCTs in refining sociological theory: A commentary on Deaton and Cartwright. Soc Sci Med. 2018; 210: 29-31. PubMed Abstract | Publisher Full Text Bo...