The purpose of this study was to examine the relationship between managerial practices of the head of educational institutions and the organizational citizenship behavior of teachers. The study was carried out to achieve three objectives: (a) To analyze the existing managerial practices of secondary school heads, (b) to study the organizational citizenship behavior (OCB) of teachers of secondary schools and (c) to investigate the relationship between managerial practices and OCB of secondary school teachers. In order to achieve set objectives, following research questions were designed: 1. How do heads of the secondary schools exercise their managerial practices with regard to Dominance, Influence, Steadiness and Conscientiousness? 2. How do the teachers of secondary schools play their role in the context of Altruism, Conscientiousness/Generalize compliance, Sportsmanship Courtesy and Civic Virtue? 3. What is the relationship between managerial practices of Secondary school heads and OCB of teachers? The population of the study comprised of all (1618) Heads and (21780) teachers of Secondary Schools of KPK. Multistage sampling technique was used. There are six divisions in the province Khyber Pakhtunkhwa. Divisional headquarter of each division was selected as sample. From each district thirty four (Ten male urban, ten female urban, seven male rural and seven female rural) were chosen as a sample. In this way total sample for the study was 204 schools from six districts. For the purpose of collection of data two questionnaires based on five points Likert scale were developed, one each for heads and one for teachers. Questionnaires were distributed among head and three teachers from each school. Questionnaire for heads comprised of forty five (45) items covering necessary aspects of managerial skills and questionnaire for teachers also consisted forty five (45) items based upon organizational citizenship behavior. Data was collected by the researcher himself by visiting each and every sample school. The collected data was tabulated and analysed by using SPSS version 16. Mean, standard deviation, correlation, ANOVA and regression were used for analyses. Findings of the study show that at present heads of the institutions are using dominance, influence, steadiness and conscientiousness (DISC) model to some extent in an informal way and teachers are aware with different aspects of organizational citizenship behavior (OCB). The study also revealed that there is a strong relationship between managerial skills of heads and organizational citizenship behavior of teachers. On the bases of research findings, it has been concluded that the Heads of the secondary schools perform four basic managerial skills i.e. dominance, influence, steadiness and conscientiousness while interacting with Teachers’ OCB, in order to execute different administrative as well as teaching tasks. At the end, the researcher made some recommendations.