Homophobic harassment and bullying are persistent issues in Canadian schools despite recent initiatives to improve school climate. Among the reasons is that educators feel reluctant or ill-prepared to address these issues. The purpose of this paper is to examine how teacher education can help make schools safer by addressing LGBTQ issues and homophobic bullying. After examining the issues, with a particular focus on the Ontario context, the authors report on a workshop titled "Sexual Diversity in Secondary Schools" that they conducted with teacher candidates. The findings suggest a two-hour workshop can help teacher candidates develop better understandings of how to address LGBTQ issues in schools. Recommendations are offered for creating safe spaces in schools by developing ethical knowledge among beginning teachers.