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This study examined the trend of early marriage among adolescent girls for more than a decade in eastern Ethiopia. We analyzed data of girls in the age group of 10-17; extracted from the Kersa Health and Demographic Surveillance System database for the period of 2008–2018. The annual incidence of early marriage was calculated per 1000 person-time and Chi-square test for linear trend was run to examine the change in rates over time. The overall incidence of early marriage was 40.48/1000 girls per year (95% CI: 39.1–41.9) with increasing trend over ten years period. Higher incidence of early marriage occurred among rural resident, illiterate and unemployed girls. The findings show higher overall incidence of early marriage, its substantial differences among various socio demographic groups and increasing trend of early marriage incidence. Efforts are needed to empower rural girls to support them pursue their education and thereby reduce early marriage. <b> </b><br>