ACM SIGIR CHIIR 2025 is hosted on the unceded lands of the Woi wurrung and Boon wurrung language groups of the eastern Kulin nation. We acknowledge the Traditional Custodians of Country throughout Australia, and their continuing connection to culture, community, land, sea, and sky. We pay our respects to Ancestors and Elders past, and present, and extend that respect to all Aboriginal and Torres Strait Islander peoples today.