Trafficking in persons (TIP) is a crime and a grave violation of human rights defined in Article 3(a) of the UN Protocol to Prevent, Suppress and Punish Trafficking in Persons. It takes place in every region of the world, in both ordinary times and in times of crisis. Its root causes can include poverty and economic inequality, homelessness, structural or interpersonal violence, gender inequalities, armed conflict and post-conflict factors. TIP manifests in multiple forms affecting women, girls, boys and men who are exploited for domestic servitude, sex, forced labor, and forced marriage, among others. A growing body of research has shown that humanitarian crises may exacerbate pre-existing trafficking trends and give rise to new ones. While some forms of trafficking are a direct result of crises, such as exploitative sexual services demanded by armed groups or the forced recruitment of child soldiers, others are less evident, with traffickers thriving on the widespread human, material, social and economic losses caused by crises. Moreover, conflict and displacement have a stronger impact on trafficking risks due to the general erosion of the rule of law and the breakdown of social safety nets or the lack of other protection systems. Despite the identification of a link between TIP and emergency contexts, trafficking prevention and response is frequently overlooked or not addressed in a comprehensive manner in humanitarian responses.