The article presents a review of scientific sources and publications aimed at determining the theoretical foundations of using distance learning technologies in the training of border guard specialists. It is found that these technologies have proven to be effective in the context of improving and enhancing the quality of professional training of border guards. The application of distance learning technologies in the professional training of border guard specialists is an important and necessary element in the modern world. The main theoretical foundations that justify the use of distance learning technologies in the professional training of border guard specialists in the European Union include such aspects as learning effectiveness, cost-effectiveness, wide access to training, modernity of technology, mobility and flexibility, interactivity and cooperation, and relevance of knowledge. It is found that among a fairly wide range of studies carried out in previous years, the authors focus on the use of distance learning technologies for the purpose of training and retraining of officers and junior personal of border agencies of Ukraine and other countries, to improve their qualifications in the retraining system, to update the knowledge of border protection specialists on regulatory and legal aspects in the field of border protection, to improve their communication skills (including foreign language skills). The role of distance learning technologies in developing the leadership skills of border guard specialists, improving their tactical medicine skills, etc. is also important. The use of distance learning technologies in the professional training of border guard specialists in the European Union is an important element of responding to the challenges of the modern world. Distance learning allows to ensure the quality of professional training of border guard specialists effectively and ensure that their knowledge and skills meet modern requirements and standards. However, despite the attention of scholars to this problem, there are currently only a few publications that present the experience of using distance learning technologies in the professional training of border guard specialists in the European Union.