This study was conducted with the aim of identifying reflections of bilingualism on preschool education. Ethnographic case study design was adopted in this descriptive research. It was carried out with the participation of eight preschool teachers who were teaching at different village schools and 13 pre-school students in the Southeastern Anatolia during the educational year of 2019-2020. The research data were collected using observation, interview, document analysis and researcher's diary and analysed through content analysis. The research results showed that bilingualism at school, in the classroom and among peers was adopted as a culture. It was seen that bilingualism had negative reflections on the exercise of the preschool educational programme in terms of subjects such as understanding of activities and following of instructions and completing them. It was determined that bilingualism reflected on the teacher as making more effort and feeling incapable in some situations. Bilingualism has been shown to make some students popular among peers.