The Lancet Series on Women’s and Children’s Health in Conflict Settings aims to improve understanding of and address the special requirements of providing sexual, reproductive, maternal, newborn, child and adolescent health and nutrition services in conflict settings. The Series draws upon scholarship from the BRANCH Consortium, providing insights into the nature and dynamics of women’s and children’s health and nutrition in diverse conflict contexts globally. The Series papers articulate a way forward to fill immediate evidence and guidance gaps as well as longer term action to ensure the most effective humanitarian health response for conflict-affected women and children.