The Robert Simpson Company Limited, commonly known as Simpson's until 1972, then as Simpsons, and in Quebec sometimes as Simpson, was a Canadian department store chain that had its earliest roots in a store opened in 1858 by Robert Simpson.

In 1952, Simpson's started a 50–50 joint venture in Canada named Simpsons-Sears Limited (later Sears Canada) with Sears, Roebuck, the American retailer. Simpsons-Sears stores remained distinct from the Simpson's stores and the parent companies' agreement included language to keep them from competing too directly with each other.

The Hudson's Bay Company (HBC) purchased the Simpsons-branded stores in 1978, but they were later converted to The Bay stores by the early 1990s. As part of the 1978 agreement, American-based Sears acquired full ownership of Simpsons-Sears Limited.

Robert Simpson's original store (Simpson & Bogart after 1861), was opened in 1858 in Newmarket, Ontario at what is now 226-228 Main Street South (original building since demolished). it was co-founded with William Trent as Simpson & Trent Groceries, Boots, Shoes and Dry Goods. A fire destroyed the store in 1870, and a new dry goods store was opened two years later in Toronto. Robert Simpson lived at 384 Botsford Street in Newmarket from 1861 to 1876.

The company was renamed the Robert Simpson Company Limited in May 1896, not long before Robert Simpson's sudden death on 14 December 1897, at the age of 63. With no male heir, Simpson's death placed a heavy burden on his wife, Mary, and daughter, Margaret. They sold the business for $135,000 in March 1898 to a syndicate of three Toronto businessmen, Harris Henry Fudger (1852–1930), Joseph Flavelle, and Alfred Ernest Ames (1866–1934).

In 1912, Charles Luther (C.L.) Burton became assistant general manager at the Robert Simpson Company, then under the directorship of his old friend and mentor, H. H. Fudger. By 1929, Burton was president of Simpson's, becoming chairman of the board in 1948, when his son Edgar assumed the presidency.

The store in downtown Toronto included one of the city's most exclusive restaurants, the Arcadian Court, which opened in 1929 and still operates today (as an event space) after the store's acquisition by Hudson's Bay Company in 1978. Throughout its history, Simpsons was the traditional "carriage-trade" department store in Toronto, competing with the T. Eaton Company. The motto "You'll enjoy shopping at Simpson's" was conceived by Robert Simpson and remained the company's slogan until its acquisition by the Hudson's Bay Company.

In 1952, General Robert E. Wood, the Chairman of U.S. retailer Sears, Roebuck and Co., sent a letter to Edgar G. Burton, President of the Robert Simpson Company of Toronto, proposing a partnership between their two companies in order to serve the Canadian market. The deal to create Simpsons-Sears Limited, a Canadian catalogue and department store chain separate from the Simpsons chain, was signed on September 18, 1952, and the terms were 50-50. Each company put up $20 million and had equal representation on the new company's board of directors. The new company was to have two main objectives. The first was to expand Simpsons' existing mail-order business, which was sold to the new company. The second goal was to build a string of stores modelled on Sears, Roebuck's format right across the country.