Chapter 4, “Witnessing Absence,” pursues the paradoxical problem of nonhuman witnessing of absence, as well as the seeming absence of witnessing in violence against the nonhuman. This chapter works across the domains of war, data, and ecology to examine the traumatic absences that circulate in the everyday experience of digital media. In doing so, the chapter theorizes the concept of radical absence to understand how nonhuman witnessing makes absence intensively present through nonhuman infrastructures. Engaging with scholarship on trauma theory, media theory, affect theory, and infrastructure, the chapter explores the nonhuman witnessing of absence via digital media infrastructures. It examines four seemingly disparate case studies: ISIS beheading videos; death on Facebook; and the destruction of Indigenous sacred sites at Juukan Gorge in Western Australia by mining giant Rio Tinto.