There are substantial challenges with accessing comprehensive femicide, family, and intimate partner homicide data. More specifically, data incompleteness can flatten social identities and render many victims of homicide invisible. Current data sources in Australia, Canada, and the United Kingdom are not sufficient for research with a prevention focus. These current data sources tend to serve an administrative goal rather than a research goal. The ability to apply an intersectional lens to prevention is limited due to the lack of available information on the social identities of victims. This challenge results in some groups of femicide being more invisible than other groups of victims. The researchers suggest key recommendations for official data collection methods that can help inform the development of femicide prevention initiatives.