The article discusses the diversity of sources in data journalism (Big Data). The research showed that journalists actively use open government database sources, commercial sources, social media, and user-generated content. The characteristics of each type of source, as well as methods for collecting and analyzing them, are identified. An analysis of data handling practices was conducted, highlighting key problems and challenges. Special attention is given to verifying the accuracy of information and adhering to journalistic ethical standards. The theoretical significance of the work lies in the systematization of knowledge about types of data sources in journalism. The practical significance of the work consists of developing recommendations for journalists on the effective use of diverse data sources. This helps avoid errors in information processing, improves verification processes, and enhances the quality of produced materials. Journalists will be able to analyze data better and present information in an accessible and understandable manner. The theoretical and methodological foundation of the study comprises general scientific methodologies of historical-philosophical analysis and general theory of cognition. The methodological basis of the article consists of works that describe the evolution of big data. As a result of the study, it was established that the diversity of data sources has a significant impact on modern journalism. Journalists use various types of data: open government databases, commercial sources, social media, and user-generated content. Each of these sources requires an individualized approach to the collection, verification, and analysis of information, resulting in more accurate, objective, and high-quality journalistic materials. The results allow for the conclusion that the proper use of different data sources enhances audience trust and improves the quality of journalistic publications. The classification of sources and the analysis of methods for their collection and processing help journalists better navigate the vast flow of information and choose the most reliable data for their materials.