Food insecurity has become an increasingly pressing issue during the COVID-19 lockdown in India, particularly in the rural areas. The COVID-19 pandemic had a strong impact on livelihoods and economic activities, resulting in a significant increase in the prevalence of food insecurity. The objective of this study is to examine the sociodemographic determinants of food insecurity among the rural poor in India during the COVID-19 lockdown. Methods Data for this study were extracted from the COVID-19-Related Shocks in Rural India 2020 survey (Round 2, 2020). Study areas included: Rajasthan (n=930), Uttar Pradesh (n=778), Bihar (n=1,073), Jharkhand(n=890), Madhya Pradesh (n=823) and Andhra Pradesh (n=511). Results Overall, 26.1% of respondents reported having reduced portion sizes or meals, 5.7% reported someone in their household going hungry, and 5.9% indicated they had run out of food. Participants from Scheduled Castes had a higher risk of reduced portion sizes (RR=1.54; 95% CI=1.26,1.89) and running out of food (RR=1.57; 95% CI=1.01,2.45). Male sex was associated with a lower risk of reduced portion sizes (RR=0.82; 95% CI=0.72,0.93). Compared to participants from Rajasthan, those from states such as Uttar Pradesh, Bihar, and Madhya Pradesh had significantly higher risks of experiencing all three food insecurity indicators. For instance, participants from Bihar had the highest risk for reduced portion sizes (RR=3.14, 95% CI=1.95,5.06), someone being hungry and not eating (RR=3.14, 95% CI=1.95,5.06), and running out of food (RR=2.79, 95% CI=1.66,4.68). Conclusion The results indicate that when designing food security programs in rural India, it is important to consider factors such as gender, household size, religion, occupation, and region. Additionally, non-farming households faced higher relative risks of food insecurity, emphasizing the necessity for targeted interventions and support to address the vulnerabilities of these households. All rights reserved, Elsevier.