Global hunger index (GHI) is a global measurement to assess the level of hunger and undernutrition in children under five at the global, regional and national levels. Using a subnational global hunger index (GHI-SN) with a simple indicator can be used to compare health status in each level and monitoring of health program achievement considering the global target. However, the validity and reliability of the subnational hunger index need to be adjusted. This objective study to ensure validity and reliability subnational global hunger index to assessing health inequality in children under five in Indonesia. Method. This is secondary data analysis using aggregate data prevalence of malnutrition and child mortality based on national basic health research survey report ( 2007, 2010, 2013,2018 ) and demographic survey report in 2002, 2012, 2017. Subnational hunger index was calculated in four domain (prevalence undernutrition, stunting, wasting and child mortality) that has been standardized previously. The validity and reliability of each domain and GHI-SN score were calculated to asses construct validity and reliability within indicator by period. Bivariate analysis using Pearson was used to asses correlation and similarity with another index, therefore can be considered to be an alternative and comparable index. Results. The subnational Global hunger index score was a descendant of GHI that it is performed by four domains. Validity construct using factor analysis shows the total percentage of variance was 56.32%, and each domain was reliable between period. Reliability analysis shows Cronbach Alpha Coefisien > 0.90. Pearson correlation between GHI-SN and Health Index status of children under five ( IPKM) 2013 and 2018 and IKPS index shows a strong correlation with r : -0.8: -0.67, respectively. Conclusion. Subnational Global Hunger Index (GHI-SN) was valid and reliable and can be used to be an alternative measurement tool to asses health inequality and hunger in children under five in Indonesia.