“Vulnerability” is a word that is typically understood as a neutral description of the state of being at risk of harm in some way. Humanitarian efforts to support people exposed to an ongoing, increased risk of different kinds of distress generally use the label “vulnerable groups” to instil reactions by the general population or people in powerful positions aiming to ameliorate the defined vulnerability. This is not the least prevalent in relation to migrant children, who are also the focus of my recent research where I have studied the everyday lives of undocumented migrant children and families in Malmö, Sweden, and Birmingham, UK (Lind 2020). Drawing on this research, in this entry, I define my application of the concept of vulnerabilisation and how it can be understood in relation to the food insecurity of undocumented migrant families.