The purpose of this study is to analyse the environmental supportive administrative services provided by principals for effective classroom management in public and private secondary schools in Anambra State. One research question and one null hypothesis guided the study. It was a descriptive study conducted in Anambra state covering the six education zones in the state. A total of 15,990 respondents constituted the population for the study. A sample of 852 teachers was used. The instrument for data collection is a structured questionnaire developed by the researchers. The questionnaire was duly validated by experts who are lecturers. The reliability of the instrument was also established. Cronbach alpha statistic was used to determine reliability which gave the reliability coefficient of 0.81. The instrument was administered on the respondents directly by the researchers who assisted by six research assistants. Out of 852 copies of the questionnaire distributed, 850 copies were correctly filled, retrieved and subjected to statistical analysis. The data were analyzed using mean ratings to answer the research question and t- test to test the hypothesis at 0.05 level of significance. Findings indicated that, in public secondary schools, adequate workshops are not provided as part of environmental supportive administrative services for effective classroom management. Accordingly, it was among others recommended that government should organize workshops for secondary schools on environmental supportive administrative services.