The DIGHT-Net Summer School "Theorising Digital Cultural Heritage" takes place at the University of Turku, August 24-26, 2026. This summer school explores the conceptual framework of digital cultural heritage and promotes interdisciplinary discussion around the theme of theorising digital cultural heritage. It invites PhD researchers to examine how the digitisation of cultural heritage, together with rapidly evolving technologies, both challenges established research paradigms and opens up new avenues for scholarly innovation. The summer school examines newly emerging critical vocabularies and working concepts of digital cultural heritage and uncovers their theoretical underpinnings. Lectures and workshops will address critical discussions surrounding different aspects of digital cultural heritage and explore what are the key concepts of digital cultural heritage today and tomorrow.