There are many men in the world that oppose the rigid, inequitable and violence-endorsing social norms which contribute to driving conflict and insecurity. But peace processes continue to be dominated by the voices, perspectives and needs of those men who hold power. Working collaboratively with men, women and other stakeholders is critical to challenge the gendered root causes of violence and armed conflict and advance feminist peace based on the principles of equality, justice and demilitarised security. As part of the Confronting Militarised Masculinities initiative, this research examines how the “war system”, and related war economies, are enmeshed with practices and representations of masculinities. It shares rich insights and analysis gleaned from four diverse countries – Afghanistan, Cameroon, the Democratic Republic of Congo and Colombia to help contribute toward alliance-building both nationally and globally.