James Thin was a Scottish bookseller, stationer and publishing company. It was, until 2002, the principal academic bookshop in Edinburgh, with its main premises near the University of Edinburgh on Infirmary Street. It also had branches in other cities, including Perth, Dundee, and Inverness. The firm was founded by James Thin (1824–1915), taking over the assets of an earlier bookseller. The business grew and expanded, and brought James Thin a significant role in Edinburgh intellectual society. The author Muriel Spark wrote all her novels on 72-page notebooks from James Thin.