Benjamin Weinreb (1912–1999) was a British bookseller and expert on the history of London who in 1968 sold his entire stock to the University of Texas.

He tried his hand at writing about theatre with part-time bookselling but did not start his first proper book dealing business, "Dipsas", until 1945.

[2] His catalogues set new standards for detail and prices and he worked with specialists in other fields, for maps and religious books, when he needed to.

He was always prepared to buy large lots whether he had the cash flow to justify the purchase or not and his readiness to do deals sometimes frustrated his partners.

Weinreb was married to the textile designer Kay Lazarus, and later Joan Kingdom Row who predeceased him.