The book "Metrology and standardization of petroleum products (basic concepts and legal foundations)", created by the team of authors, is a unique work that will become an indispensable assistant for specialists in the field of oil industry, metrology and standardization. This publication not only illuminates theoretical aspects, but also immerses the reader in the practical application of the knowledge necessary to work with petroleum products. In today's world, where product quality and safety play a key role, understanding metrological and standard frameworks is becoming especially important. The book covers a wide range of topics, ranging from the basic concepts of metrology to the legal aspects governing the standardization of petroleum products. The reader will be able to learn about the measurement methods necessary to assess the quality of petroleum products, as well as international and national standards that ensure that products meet modern requirements. This book will be of interest not only to professional metrologists and engineers, but also to students studying in specialties related to the oil and gas industry. It can also attract the attention of lawyers working in the field of certification and standardization, as well as anyone interested in the topic of quality and safety of goods. The age category of readers varies from senior students to experienced professionals who want to update their knowledge in this area. The topics raised in the book cover not only technical aspects, but also legal issues, which makes it especially valuable for a comprehensive understanding of the subject. The authors pay attention to current problems related to quality control and safety of petroleum products, as well as analyze current trends in the field of standardization. This allows the reader not only to gain theoretical knowledge, but also to understand how they are applied in practice. The style of writing the book is clear and accessible, which makes complex concepts understandable even for those who are just starting their way in this area. The team of authors includes experts with many years of experience, which gives the book additional value. Each of the authors makes a unique contribution.