This study analyzes the relationship between homicides due to the armed conflict and educational efficiency in 912 municipalities in Colombia between 2014 and 2018, through the Saber 11 standardized test and school pass rates. The objective of this research is to evaluate the potential loss of educational efficiency related to homicides linked to the armed conflict in Colombian municipalities. A conditional robust non-parametric approach is applied, incorporating armed conflict as an environmental variable. Results show, primarily, that armed conflict deaths in the municipality are associated with lower educational efficiency; additionally, conflict in both local and neighboring municipalities is found to be significantly correlated with level of educational inefficiency.