Located in the field of critical security studies and information and communication sciences, this dissertation has a main goal to determine does open source intelligence present productive resource of knowledge in counterterrorism and in counterterror. The unit of analysis is an opensource database (GTD), that records global terrorist events since the 1970. Subunits are terrorist organizations that are selected according to the geographic criteria; a terrorist organization from Europe, South America, Africa and Asia, then the criteria of typology of terrorism; one fundamentalist and one secular terrorist organization and a terrorist organization with the highest number of terrorist attacks recorded over the period from 1972 to 11 September 2001, and a terrorist organization with the highest number of terrorist attacks in the period from 12 September 2001 to the end of 2017. We identified key features of intelligence from publicly available database, which consists of recorded terrorist attacks, in the creation of an intelligence product, primarily their reliability, accuracy, coherence, comprehensibility, longitudinality, data processing capability, simplicity of data presentation and usage of analytical techniques for further utilization and their actionable character. The researched application of open source intelligence in counterterrorism is reflected in providing of contextual knowledge about a terrorist organization, detection of its national or supranational characteristics, geospatial and temporal activity, target focus and terrorist modus operandi. The applicability of open source intelligence in counterterrorism is manifested as well in detecting trends and patterns of terrorist behavior, predicting future locations of terrorist activity, revealing the strengths, advantages, disadvantages and opportunities of terrorist organizations. While from the aspect of counterterror, the applicative value of open source intelligence is visible when assessing the risk of terrorist threat, defining the security status of a specific area and establishing mechanisms of repression from the spectrum of counterterror. As the subject of research is rather new with unsettled terminological and theoretical problems in the first stage we authenticate central terms. After analyzing the available literature we nominate translation for each of the terms (intelligence and open source intelligence), which version will be operational throughout the research. In order to achive an operational definition of work, i.e. key features of the term, content analysis and synthesis of exsisting knowledge in the field of information sciences and intelligence studies was used. Based on constructed database of exsisting definitions of intelligence (N=50), we use qualitative and quantitative methodology (content and frequency analysis) to propose a new definition of term intelligence. According to excluded constitutive elements, definition of intelligence stands for collected and analyzed information created for end users in order to make decisions.