objectives To evaluate the impact of integrated mental health care upon food insecurity (FI) in households of people with severe mental illness (SMI) in a rural Ethiopian district, and to investigate mediation by improved work impairment and discrimination.methods A community-based, controlled before-after study was conducted. People with probable SMI were identified in the community, diagnosed by primary healthcare workers, with diagnostic confirmation from a psychiatric nurse. Households of a person with SMI were matched to control households. District-wide integration of mental health care was implemented. Change in FI status over 12 months of follow-up was measured using the Household Food Insecurity Access Scale. Multivariable models were used to assess improvement in FI. Direct and indirect mediators of change in FI status were modelled using path analysis.results A total of 239 (81.8%) people with SMI and 273 (96.5%) control households were assessed after 12 months. Maintenance of food security or improvement in food insecurity status was observed in 51.5% of households of a person with SMI vs. 39.7% of control households (adjusted risk ratio 1.41: 95% CI 1.11, 1.80). Reduction in symptom severity was indirectly associated with improved FI status via an impact on reducing work impairment and discrimination (P < 0.001).conclusions Improving access to mental health care may reduce food insecurity in households of people with SMI. Optimising engagement in care and adding interventions to improve work functioning and tackle discrimination may further reduce food insecurity.keywords poverty, mental illness, schizophrenia, bipolar disorder, sub-Saharan Africa, task-sharing Sustainable Development Goals (SDGs): SDG 2 (zero hunger), SDG 3 (good health and well-being), SDG 8 (decent work and economic growthSDG 10 (reduced inequalities), SDG 17 (partnerships for the goals)