Abstract Cybertechnology has become a fundamental part of educational institutions, with the student’s routine to use these technologies to communicate, learn and play, causing a need for understanding the impact and general principles of ethical computer use in academia. However, the practice of cyberethics in these environments has presented many challenges for the institutions. This study, based on the theory of planned behaviour, examined the differences in ethical cyber behavioural intention of Nigerian and South African students using a multi-group analysis. The study adopted a survey research design– structured questionnaires were randomly distributed among students of two purposively selected universities, one in South Africa and the other Nigeria. Structural equation modelling was employed to test the proposed model fit. Overall, 450 undergraduate students participated in the survey; 343 respondents completed and returned the questionnaire, resulting in a response rate of 76.2%. The subjective norm was found to be statistically significant in influencing students’ ethical cyber behavioural intention with cyber technologies. The study contributes to the extant literature on the application of the Theory of Planned Behaviour (TPB). The originality and value of this study can be viewed from the application of a socio-psychology theory to determine ethical cyber behavioural intention in relation to cybertechnology, which provides further evidence that the TPB can be applied to cyberethics research. Moreover, to the best of authors’ knowledge, this is a pioneer study that comprehensively examines the linkage of components of TPB with ethical cyber behavioural intention in joint samples from South Africa and Nigeria.