The aim of this study is to analyze the relation between preschool teachers' decision making styles and attachment styles in the context of classroom management. Correlational Survey Method, which is one of the quantitative research methods, has been used in the study. The universe of the study comprises preschool teachers working in state and private schools in the European part of Istanbul. The sample of the study, which is 380 preschool teachers, has been selected through random selection. The data of the study have been collected through Teacher Information Form, Melbourne Decision Making Questionnaire I-II and Relationship Scale. Considering the relation between decision making styles and attachment styles as a result of the study, no significant relation has been found between vigilance decision making and attachment styles. There is weak and very weak relation between buck-passing, procrastination and hypervigilance decision making styles and fearful, preoccupied and dismissing attachment styles. A significant relation has been observed between decision making styles and income level and fathers' educational level. A significant relation has been noted between attachment styles and income level. There is no significant relation between other variables (sex, age, level of education) and the two styles.