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Description: Objectives The risk of intimate partner violence (IPV) against women with disability is believed to be high. We aimed to compare the prevalence of past-year IPV against women with and without functional difficulties in urban informal settlements, to review its social determinants, and to explore its association with mental health. Design Cross-sectional survey Setting Fifty clusters within four informal settlements. Participants 5122 women aged 18 to 49 years. Primary and secondary outcome measures We used the Washington Group Short Set of Questions to assess functional difficulties. IPV in the past year was described by binary composites of questions about physical, sexual, and emotional violence. We screened for symptoms of depression using the Patient Health Questionnaire 9 and of anxiety using the Generalized Anxiety Disorder 7. Multivariable logistic regression models examined associations between functional difficulties, IPV, and mental health. Results The 10% of participants who screened positive for functional disability had greater odds of experiencing physical or sexual IPV (Adjusted Odds Ratio (AOR) 1.68, 95% CI 1.23, 2.29) and emotional IPV (1.52, CI 1.16, 2.00) than women who screened negative. Women who screened positive for functional disability had greater odds than women who screened negative of symptoms suggesting moderate or severe anxiety (AOR 2.50, CI 1.78, 3.49), depression (2.91, CI 2.13, 3.99), and suicidal thinking (AOR 1.94, CI 1.50, 2.50). Conclusions The burden of IPV fell disproportionately on women with functional difficulties, who were also more likely to screen positive for common mental disorder. Public health initiatives need to respond at local and national levels to address the overlapping and mutually reinforcing determinants of violence, while existing policy needs to be better utilised to ensure protection for the most vulnerable.