This report describes the implementation and short-term results of a peer group intervention for HIV prevention on the HIV-related attitudes, knowledge and behaviours of primary school teachers in Malawi. The intervention, based on the social-cognitive learning model, took place in 2000 at two teacher training colleges with a distance-learning programme. Primary school teachers attending a final six-week training session before certification volunteered to participate. Group leaders were teachers selected by each group, and after training they facilitated the peer group intervention. The teachers completed a pre-test and post-test questionnaire. The 286 trainee teachers whose pre- and post-test samples could be matched, largely reported positive changes in their HIV-prevention-related knowledge, attitudes, self-efficacy, behaviour change and condom-use intentions. However, at post-test immediately after the intervention they did not show a higher level of perceived-risk, a greater hope that people could change their high-risk sexual behaviour, or greater agreement that persons infected with HIV should be allowed in public places. This research demonstrates the feasibility of an HIV-prevention intervention for primary school teachers during their training. The Malawi Ministry of Education has since made the programme available to over 90 per cent of all trainee teachers through an NGO.