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The existence of hypopigmentation like leucism is the result of genetic anomalies that might be enhanced by external factors such as pollution. This anomaly may reduce survival rates. Leucism has been recorded in wildlife, but overall, it is considered very rare. There have been few records of mantled howler monkeys with leucism in Mexico and Costa Rica, but whole‐body leucism in howler monkeys from South America was unknown. In this article, we report for the first‐time documented cases of whole‐body leucism in young individuals of mantled howler monkeys Alouatta palliata in an isolated remanent of tropical dry forest in southwestern Ecuador known as Cerro Blanco Protective Forest. In total, we found two juvenile individuals with leucism in October 2021. The report of howler monkeys with whole‐body leucism may be caused by two processes: inbreeding because of isolated populations, environmental pressure caused by pollution, or the interaction of both. Our findings also reveal that hypopigmentation is becoming more frequent in howler monkey populations along its distributional range. Therefore, it is important to promote research in this field to disentangle the causes of hypopigmentation and to consider a regional management strategy for the species. [ABSTRACT FROM AUTHOR]