This rapid review synthesises evidence on gender as a causal factor in different inter and intra state conflicts. It focuses on evidence from the year 2000 onwards, identifying specific case examples and describing how gender acted as a causal factor in each case. This may include, for example, the influence of the impact of ‘thwarted masculinities’, gender based violence (GBV) as a driver, or the influence of hegemonic masculinity in motivations for joining armed groups. The case studies presented in the report (Iraq, Northern Uganda, Colombia, Nepal. Sri Lanka, Myanmar, Sudan and South Sudan, and Kosovo) are the best evidenced in the literature identified to demonstrate the links between gender norms and conflict, and the ways that gender drivers are linked with causal factors.