International organization responsible for the assignment and management of International Standard Serial Numbers.

The ISSN International Centre is an intergovernmental organization based in Paris that manages the International Standard Serial Number (ISSN) system. Established in 1976, the Centre coordinates a global network of national ISSN centres to assign unique eight-digit identifiers to serial publications such as journals, magazines, newspapers, and other periodicals. The ISSN system is standardized as ISO 3297 and is widely used in library cataloging, publishing, and scholarly communication infrastructure.