Introduction: Literature revealed that individuals with Autism Spectrum Disorders (ASD) experience significantly more feeding problems and obesity compared to their peers. This study was designed to investigate the nutritional status and dietary patterns of children with autism in different age groups in Dhaka city, Bangladesh. Methods: This cross-sectional study was conducted among 193 individuals with ASD. A questionnaire was used as a tool to collect information from the mother of the respondents and anthropometric assessments were conducted by measuring height and weight. The dietary patterns of the respondents were taken using a food frequency questionnaire. Results: The age range of the participants were between 3-18 years. It was found that 11.9%, 19.7% and 23.3% of the participants were underweight, overweight and obese, respectively according to Body Mass Index (BMI)-for-age. About 70% of the respondents had medium Individual Dietary Diversity Score (IDDS). In addition, the association between IDDS and obesity was significantly correlated (p=0.00). Individuals with ASD exhibited similar food preferences across most age groups with little changes. Conclusion: Our study figured out that the prevalence of overweight increased in accordance with age among children with ASD. They have a tendency to prefer likeness and routine in their diet, which expands the tendency to have an imbalanced diet. A dietary guideline including seven food groups should be followed to improve their nutritional status and dietary practices.