Simpkin & Marshall was a British bookseller, book wholesaler and book publisher. The firm was founded in 1819 and traded until the 1940s. For many decades the firm was Britain's largest book wholesaler and a respected family-owned company, but it was acquired by the media proprietor Robert Maxwell and went bankrupt in 1954, an event which, according to Lionel Leventhal, "sounded a warning to the book trade about Captain Robert Maxwell's way of doing business".