This chapter offers a comprehensive introduction to online sources of archival and other materials that are particularly relevant to the study of Brazil. In recent decades, advances in information technology have significantly enhanced the capacity of scholars across the globe to access and engage with a wide array of primary and secondary sources. Researchers can now conduct rigorous investigations using digitised collections, databases, and repositories that span national boundaries and disciplinary fields. The guide begins by surveying websites and digital platforms that focus specifically on Brazil, including governmental archives, academic institutions, and cultural organisations. Recognising Brazil’s historical and linguistic ties with Portugal, the chapter then turns to Portuguese websites that host substantial content related to Brazil’s colonial past, legal frameworks, and shared cultural heritage. Following this, attention is given to international organisations and nongovernmental entities whose online resources contribute valuable perspectives on Brazil’s development, governance, and global engagement. These include multilateral institutions, advocacy groups, and research networks with thematic relevance to Brazilian studies. The final section broadens the scope to include official and unofficial online sources from a diverse range of countries and repositories–some public, others private. These platforms offer access to documents, datasets, and multimedia materials that enrich the study of Brazil from comparative, transnational, and interdisciplinary angles. Together, these resources form a dynamic and evolving landscape of digital scholarship, enabling researchers to deepen their understanding of Brazil’s past and present through accessible, high-quality online materials.