Purpose: Previous studies suggest that officers' level of rape myth acceptance (RMA) is predictive of their case decision making and judgements towards victim-survivors. However, few studies have directly assessed the relationship between RMA and responsibility and authenticity judgments. Methods: 808 UK police officers categorised as 'high' or low' in rape myth acceptance made judgements of victim and perpetrator responsibility, and case authenticity, towards one of 16 vignettes depicting a hypothetical rape scenario varying on victim-perpetrator relationship, victim reputation, and initial point of resistance. Results: Officers categorised as 'high' in RMA rated victims as more responsible, perpetrators as less responsible, and cases as less authentic than those deemed to be 'low' in RMA. When rape-myth related factors were present, both individually and in combination, judgements by officers 'high' in RMA were more negative than those 'low' in RMA. Conclusions: Results suggest that officers 'high' in RMA may judge victims of rape differently to those 'low' in RMA, particularly when rape myth-related extra-legal case factors are present. The potential implications for training and selection are discussed.