Persistent issues of bullying, harassment, and other exclusionary behaviours remain prevalent in research and academic settings, disproportionately impacting underrepresented groups. Bystander intervention offers a proactive approach that enables individuals to safely counteract these instances of exclusionary behaviours and support those who are targeted. This Short Course is facilitated by ADVANCEGeo and is designed to equip participants with the skills to be effective active bystanders. Workshop participants will be trained to: (i) discern various types of hostile behaviours such as bullying, microaggressions, and sexual harassment, (ii) identify the institutional structures and practices in research and academia that support their prevalence, and (iii) respond in a manner that's both safe and constructive.