ABSTRACT. With the increasing information technologies usage, attacks and threats towards information technologies have been increasing in the same way. Because of this, it is necessary to examine Computer Education and Instructional Technology (CEIT) teacher candidates' efficacy perceptions to teach information security. The study carried out with survey method and participants were consisted of 375 CEIT teacher candidates. Data were collected with "Information Security Efficacy Perceptions Survey" (Pusey & Sadera, 2011). And the survey was adapted to Turkish by authors. According to the results, the majority of participants haven't taken any course or lecture about information security. Furthermore, CEIT teacher candidates' efficacy perceptions to teach information security is not well enough in many information security topics. Based on the results, it is thought that it will be useful to put a compulsory course to CEIT program. Keywords: Information Security, efficacy perception, CEIT, teacher candidates SUMMARY Purpose and significance: Information technologies hold many benefits in education through problem solving, interaction, communication etc. In addition to these benefits, information technologies are known to cause some problems. The treats and cyber-attacks to information technology have been increasing; while usages of these technologies have been dramatically increasing. From this point, it is a crucial responsibility for teachers to protect our children from information security problems. Therefore, CEIT teacher candidates' information security capabilities should be investigated. This study examined these CEIT teacher candidates' efficacy perceptions about teaching information security topics.