Per- and polyfluoroalkyl substances (PFAS) are widely used in various applications due to their unique properties, such as high persistence and environmental persistence. The study provides a comprehensive overview of over 200 use categories and subcategories for more than 1400 individual PFAS, highlighting their diverse applications in industries and consumer products. Despite being non-exhaustive, the study demonstrates that PFAS are used in almost all industry branches and many consumer products, including ammunition, climbing ropes, guitar strings, artificial turf, and soil remediation. The paper also discusses the environmental significance of PFAS, their cost-effectiveness, and the challenges in identifying essential and non-essential uses. The methods section outlines the sources of information used, including literature, databases, patents, and company data, to compile the inventory. The results section details the identified use categories, the substances used, and the quantities employed, with a focus on the Nordic countries and the US. The discussion addresses the scope and uncertainties of the study, emphasizing the need for more comprehensive data and harmonization of use categories to improve future inventories.Per- and polyfluoroalkyl substances (PFAS) are widely used in various applications due to their unique properties, such as high persistence and environmental persistence. The study provides a comprehensive overview of over 200 use categories and subcategories for more than 1400 individual PFAS, highlighting their diverse applications in industries and consumer products. Despite being non-exhaustive, the study demonstrates that PFAS are used in almost all industry branches and many consumer products, including ammunition, climbing ropes, guitar strings, artificial turf, and soil remediation. The paper also discusses the environmental significance of PFAS, their cost-effectiveness, and the challenges in identifying essential and non-essential uses. The methods section outlines the sources of information used, including literature, databases, patents, and company data, to compile the inventory. The results section details the identified use categories, the substances used, and the quantities employed, with a focus on the Nordic countries and the US. The discussion addresses the scope and uncertainties of the study, emphasizing the need for more comprehensive data and harmonization of use categories to improve future inventories.