This chapter synthesizes research on the nature of LGBTQ IPV, including the tactics comprising and the prevalence of each form of IPV (psychological, physical, and sexual IPV, along with intimate-partner homicide), its directionality (i.e., how common it is that one or both partners in a relationship uses IPV tactics, as well as how motivations like self-defense color the so-called mutual-battering debate), where and when it occurs, and outcomes for victims. Where possible, estimates within LGBTQ populations are broken down by sexual orientation, gender identity, trans*-cisgender identity, race and ethnicity, age, and nationality. Comparisons are likewise drawn between sexual minority and heterosexual victims as well as between trans* and cisgender victims. Given that methodological differences have the potential to substantially impact results, an effort is made to largely make apples-to-apples comparisons between similar studies (such as by comparing studies using the same IPV lifetime victimization time frame), and IPV frequency findings are divided into those emerging from probability versus non-probability sampled studies. Quantitative data in this chapter, as well as throughout the book, is leaned on for population estimates, which is then repeatedly contextualized with high-detail qualitative data. The chapter concludes with implications for future policy, practice, and research.