Background Diarrhea is a common diseases and each year around 5 billion children suffer from this diseases globally. According to BDHS 2017-18, 21% mothers had no education. Moreover, maternal education might consider to be one of the important aspect which plays a great role to diarrheal incidence. So the aim of this study is to explore the association between level of maternal education and recent episode of diarrhea among under five children in Bangladesh. Method The quantitative cross-sectional study utilized the secondary data from Bangladesh Demography and Health Survey (BDHS) 2017.Data was collected from Women’s Questionnaire and total 8398 mothers having  children aged 0-59 months were selected. Descriptive analysis, crosstab chi-squared tests, and logistic regression analyses were conducted to describe the background characteristics of the participants and explore the association between exposure and outcome of interest. Result Approximately 5% of the children had diarrhea and 17% of the mothers had higher level of education. Children whose mother had higher education had 30% lower risk of having diarrhea (OR=0.70, CI 0.44-1.13) compared to the children having uneducated mother. However, findings revealed that there is no significant association between maternal education and the incidence of diarrhea in the study population.  Conclusion  Based on this study, maternal education has no association with diarrhea among under five children. However, there might be several other factors responsible for the reduction of diarrheal diseases other than maternal education.