The study investigated the ?Effect of Behaviour Contract on Social Phobia Among Junior Secondary School Students in Zaria Metropolis of Kaduna State, Nigeria?. Three objectives guided the study, related to these are three research questions and three null hypotheses. The design adopted in this study was quasi-experimental design involving the pre-test and post-test design. The population of the study consist of all 85 Students identified with social phobia problem in the five selected secondary schools located in Zaria Local Government Area of Kaduna State. A sample size of 10 Junior Secondary School (JSS II) students was selected from GJSS Gyellesu. This consists of 5 male and 5 female students that were identified with mild and moderate levels of social phobia. These students served as the treatment group and were subjected to a training on the package tagged ?'Behaviour Contract Training Package (BCTP)''. The researcher used purposive sampling technique in identifying students with social phobia , The Social Phobia Inventory (SPIN), ) was adapted in this study. The data collected from the pilot study were statistically analyzed to ensure the reliability co-efficient. The Cronbach Alpha Reliability Co-efficient was used to calculate the reliability coefficient of the instrument. Consequently, reliability co-efficient of alpha level of 0.822 was obtained for the instrument. The analysis presents the bio data variables of gender and social phobia Levels of the students in frequency and percentages. Descriptive statistics of frequency, item mean and standard deviation were used in answering the research questions, t test was used for testing hypothesis one and analysis of covariance(ANCOVA)was used in testing hypothesis two and three. It reveals that behavior contract had a significant effect on reducing social phobia among junior secondary school students. with a significant decrease in Social phobia;(F=0.000)and there was no significant gender differences in the effect of behaviour contract among male and female Juniour Secondary School Student,(F=0.228,)(P=0.641); and there is no significant differential effect of behavior contract on mild and moderate levels of social phobia among Juniour Secondary School Students(F=1.309;(P=0.269.) It was recommended that counselors and Psychologists should make use of behaaviour contract in handling problems of social phobia among Juniour secondary school students. counselling technique in assisting students that exhibits characteristics of social phobia