The present study aimed to comparatively analyze the undergraduate preschool instruction curriculum, introduced in 2018 in teacher training institutions, and the 1997 and 2006 undergraduate curricula. The document analysis method, a qualitative research approach, was employed in the study. The 1997, 2006 and 2018 undergraduate preschool instruction curricula developed by the Council of Higher Education were employed as the data collection instruments. Descriptive analysis technique was adopted to analyze the findings. The study findings demonstrated that the 2018 undergraduate preschool instruction curriculum differed from the 1997 and 2006 curricula. The number of compulsory field courses and total course hours in the 2018 undergraduate preschool instruction curriculum was lower when compared to the previous curricula. Especially in the 2018 undergraduate curriculum, it was observed that the applied course hours were lower when compared to previous programs, and the categories of certain courses included in the MB, GK and AE categories the previous programs were altered in the 2018 curriculum. Certain compulsory courses in the 1997 and 2006 curricula were included in the elective course category in the 2018 undergraduate curriculum. The names and content of certain the courses were changes in the 2018 undergraduate curriculum. It was observed that the number of elective courses was increased in 2018 undergraduate curriculum.