Background Diarrhea remains a major cause of preventable mortality in Latin American and Caribbean (LAC) countries, particularly among children and vulnerable populations. However, there are no studies showing the changes that have occurred in recent years in developing countries. Our objective was to determine the evolution of diarrhea mortality rates in LAC countries between 2000 and 2019. Methods An ecological observational time series study was conducted using only countries with complete population-based data in the World Health Organization mortality database between 2000 and 2019 with diarrhea mortality. Analyses were performed using Joinpoint Regression software to calculate mortality trends and annual percentage change by sex and by country. A mortality rates analysis of the last 5 years of the study period was performed to assess the countries with the highest rates. Results Be...