This study investigated the effect of conflict resolution skills training on interpersonal conflict among secondary school students in Bauchi metropolis, Nigeria. A quasi experimental design involving pre-test, post-test control group was adopted for the study. Purposive sampling technique was used in selecting thirty (30) samples to serve as the treatment and control groups using Conflict Style Questionnaire. The selected samples were given Conflict Resolution Style Questionnaire for pre-test. The treatment group was exposed to conflict resolution skills training for a period of six weeks, while the control group received no treatment. After the treatment, Conflict Resolution Style Questionnaire was re-administered to both treatment and control groups to obtain post-test data.The hypotheses were tested using ANCOVA. The findings of the study revealed that significant effect exist in the interpersonal conflict of students exposed to conflict resolution skills trainingunlike that of the control group (F = 51.427, p = .000), significant differential effect of conflict resolution skills training does not exist between the interpersonal conflict of male and female secondary school students (F = 0.462, p = 0.499) and significant differentialeffect of conflict resolution skills trainingdoes not exists on interpersonal conflict between students of 14-17 and that of 18-21 age brackets(F = 0.007, p= 0.933). Based on the findings of this study, it was recommended among others that counselors and psychologists should be encouraged to employ conflict resolution skills training in reducing interpersonal conflict among secondary school students irrespective of gender.