The textbook "Long-Lived Nuclear Spin Order: Theory and Applications" offers a comprehensive examination of the theoretical foundations and practical applications of long-lived nuclear spin order. It is aimed at professionals and students in physical chemistry and theoretical chemistry who wish to gain a deeper understanding of the mechanisms and relevance of nuclear spin orders in various scientific contexts. The publication addresses both mathematical concepts and scientific principles that are crucial for the exploration and application of nuclear spin orders. Edited by Giuseppe Pileio, the book provides valuable insights into current research trends and innovative approaches in physical chemistry. It is written in English and was published on April 15, 2020.