James Thin Ltd was a British bookshop chain, founded by James Thin in 1848. It operated for 154 years, during which time it was run by five generations of the Thin family. Starting from a single shop in Edinburgh, it grew to a national concern with 35 branches throughout Scotland and England. In 2002, following a period of rapid expansion, it went into voluntary administration, after which most of its shops were purchased by other companies in the book trade.