Abstract : Malaysian adolescents are susceptible for an unhealthy and poor dietary practice with an augmented intake of energy-dense food items and reduced intake of nutritious food. Distinctive environmental factors are considered to influence their dietary practice, among which the major contributor is the school food environment where they spent most of their time. This study was to determine the relationship between the public secondary school students’ perception towards their school food environment and their dietary practice involving a sample size of 118 students of Form 1, 2 and 4 from all states of Malaysia. All the data was collected using online platforms through validated and pretested school food environment questionnaire and analysed using IBM SPSS 26. The students had a moderate level of perception (mean= 0.50 ± 0.02) and practice (mean= 2.73 ± 0.04) towards the school food environment. There were significant differences between the students’ perception towards the school food environment and variables namely ethnic groups (Malay, Chinese and Indian) (p-value = 0.001*), father’s education status (p-value = 0.019*), mother’s education background (p-value = 0.038*), and father’s employment status (p-value = 0.014*) respectively. There was a significant, positive, and moderate relationship between students’ perception and practice on healthy diet in school environment (p-value <0.001; r=0.246;). After adjusted for confounding variables, the relationship between students’ perception and practice on healthy diet in school environment remain significant (p-value = 0.007*; r = 0.246). The developments and strategies a healthy school food environment are crucial to enhance their perception and improve their dietary practice in the school canteen.