The current paper contributes to the entrepreneurial intention (EI) literature by applying the theory of planned behaviour (TPB) in a developing African country with unique socio-economic and cultural context. Thus it examines the influence of social norms, personal attitudes and perceived behavioural control on business start-up intentions. Based on a quantitative approach, primary survey data were collected from 306 final year undergraduate students at a public university. The data were analyzed using correlation and hierarchical regression techniques. Controlling for age, gender and field of study, the findings indicate that each of the attitudinal antecedents is significantly positively related to EI, with an overall R 2 = 0.543. For scholars, enterprise support practitioners and policy makers, the study shows that the TPB can be used to understand how to promote business start-up in developing countries with socio-economic and cultural contexts which are mostly different from developed countries where the subject is heavily researched. Specifically, mechanisms to develop entrepreneurial capabilities among citizens, improve societal norms and individual attitudes toward entrepreneurship would significantly promote entrepreneurship. The study also makes a valuable contribution to the under-researched context of Zambia and African entrepreneurship.