This report provides a comprehensive overview of the ENISA Big Data threat landscape, focusing on the key security challenges faced by organizations implementing analytics applications. It identifies top threats such as drive-by exploits, worms/Trojans, and code injection attacks, along with the threat agents including corporations, cybercriminals, employees, hacktivists, nation-states, and terrorists. The report also outlines best practices for mitigating these threats, including end-user perspectives, common terminology, and the use of case studies. Furthermore, it details methods to improve the ETL process, such as tackling bottlenecks, incremental data loading, partitioning large tables, and eliminating extraneous data. The report emphasizes the importance of data security in various sectors, including telecom, energy, and finance, highlighting the strategic plans of ENISA to combat data theft and misuse. The report also underscores the significance of protecting big data for economic growth, national security, and military applications.