This research examined preservice teachers' knowledge of emotional and behavioural disorders (EBD) and their sense of efficacy. The participants included a convenience sample of 230 undergraduate general education and special education preservice teachers enrolled in teacher education classes. The age of the participants ranged from 19 to 51 with a mean age of 23.37 years (SD = 6.8 years). The Teacher Self Efficacy Scale (TSES) (long form) and Knowledge of Emotional and Behavioural Disorders questionnaire were administered. The participants had higher efficacy in instructional strategies, classroom management, and instructional abilities than in student engagement. There was no significant correlation between field experience, additional coursework, and familiarity with a child with EBD and the preservice teachers' knowledge of EBD or self efficacy. This information is relevant to teacher programme coordinators indicating that further efforts should be made to increase preservice teachers' knowledge of EBD, and to provide strategies for identifying and working with students with EBD in classrooms.