Resilient food and nutrition systems that support dietary diversity are central to improving welfare outcomes and fostering the formation of human capital, with lasting implications for socioeconomic development. Historically, while smallholders in developing countries have accessed food both from diversified farms or kitchen gardens, markets have increasingly become the more dominant source of diet diversity as agrifood systems continue their transformation. Yet little is known regarding how intensifying conflicts and social instability affect these linkages between agrifood systems and households’ dietary diversity. Addressing this knowledge gap is particularly relevant for countries like Myanmar, which is characterized not only by escalating conflicts in recent years but also by relatively lower levels of overall crop diversification and dietary diversity at the national level compared to many other countries in East and Southeast Asia. By using unique panel datasets from Myanmar that cover significant spatiotemporal variation in conflict intensity and addressing the potential endogeneity of crop diversification, we provide new evidence on the resilience of household dietary diversity in conflict-affected settings. We find that increased incidence of violent events at township levels (a proxy for conflict intensity) significantly lowers household dietary diversity during the post-monsoon season, particularly the diversity derived from purchased food items. These adverse effects are relatively more pronounced for healthier food items, such as pulses/legumes/nuts and vegetables/leaves. However, the negative impacts of conflicts on dietary diversity in the post-monsoon season are significantly mitigated by greater diversity in food crop production for farm households during the preceding monsoon season. Results are robust across different measurements of crop diversification and violent events. These findings suggest that in conflict-prone developing countries like Myanmar, household-level crop diversification remains an important strategy for farmers to safeguard household dietary diversity.