At a time when the humanitarian debate seems firmly focused on the future – digital transformation, autonomous weapons, climate change, the race to innovate, and so on – devoting an entire issue of the Review to the concept of memory may seem out of place. But memory is an essential part of this debate for more than one reason. First, if conflict victims are to gain any relief from their trauma, the psychological impact of their experience can no longer be overlooked. Traumatic memories cause severe suffering among survivors of violence, those who have been uprooted, and the families of people who remain missing long after a conflict has ended. Humanitarian organizations are increasingly aware that they have an obligation – if not necessarily the means – to treat a form of suffering that has remained invisible or beyond their normal scope of work for far too long.