The purpose of the article is to present the results of the study focusing on the role of ego-documents as a resource for the formation and maintenance of regional identity, as well as the analysis of their use in the practices of cultural and scientific institutions, touching Siberia as a case study. Personal testimonies such as diaries, letters, and memoirs offer unique insights into how historical events and processes were perceived by their authors, making them essential elements of cultural heritage. In the context of globalization and cultural standardization, where regional identities face the challenges of universalization, ego-documents can be used in the creation of local narratives that reinforce regional self-awareness. Siberian libraries, archives, and museums actively incorporate ego-documents into the regional cultural heritage by collecting and publishing them, organizing exhibitions that present personal opinions on the history of the region. These institutions foster a sustainable regional memory and support cultural diversity, allowing Siberian residents to feel concerned in their local history. Incorporation of ego-documents into the cultural heritage also serves as a tool through which regional elites can create narratives that highlight the unique features, values, and traditions of the region.