Objectives: To determine the the association between childhood obesity and dental caries experience in a group of Egyptian preschool children, and the correlation between dietary pattern and dental caries among obese and normal preschool children.Methods: A total number of 60 Egyptian children were included, their ages ranged from 2 to 5 years old. Study sample consists of 2 equal groups, Group I: a group of 30 obese preschool children, apparently free from other systemic conditions, were selected from the out-patient clinic, National Nutrition Institute, and Group II: an equal group of 30 preschool children (control group), apparently free from any systemic condition, were randomly chosen from two nurseries in Cairo. Dental examination was performed to get the caries index (dmf). Height and weight measurements were recorded to calculate the BMI (Body Mass Index). Dietary pattern assessment was done using 24hours diet history recall method.Results: there was statistically non-significant difference between the number and percentage of dmf scoring for different tested groups at P-value 0.3. Concerning the correlation between dmf and number of snack intake and dietary pattern among obese and normal children according to Sperman’s correlation there were insignificant correlations. Conclusion: Obesity was not significantly associated with dental caries experience in preschool children, and there was no association between dental caries experience and snack intake and all dietary patterns.