Aims: The aim of this study is to compare the nutritional habits of children attending half-day and full-day school and to investigate the effect of time spent at school on their nutrition. Methods: A survey was conducted between January 2020 and April 2020 for students between the ages of 6 and 18 years who attended school and agreed to participate in the study. Written consent was obtained from parents. The data were analyzed using IBM SPSS V16.0. Results: A total of 772 people were included in the study; of these, 385 students attended half-day school and 387 students attended full-day school. Daily meal frequencies of the students varied based on their schooling time, which was statistically significant (p = 0.011). Out of all the students who attended full-time school, 15.2% stated that they ate four or more meals per day, while 7.8% of those who attended half-day school stated that they ate four or more meals per day. When their dieting status was examined, 3.9% of those who attended half-day school and 1% of those who attended full-day school stated that they were on a diet. Conclusion: In order to avoid unhealthy nutritional habits caused by different characteristics and durations of schools, necessary information should be given to the students in the form of lessons. In addition, the selection of foods for the students who eat their meals in educational institutions should be made and controlled by experts who specialize in this field.