J D Wetherspoon plc (LSE: JDW) is a British pub chain based in Watford. Founded as a single pub in 1979 by Tim Martin, the company now owns 835 outlets. The chain champions cask ale, low prices, long opening hours, and no music. The company also operates the Lloyds No. 1 chain and Wetherspoon Hotels.

It is listed on the London Stock Exchange and is a constituent of the FTSE 250 Index.

The Company was founded in 1979 by Tim Martin, who opened the first Wetherspoon pub, 'Marler's Bar', at Colney Hatch Lane in London. Many of the other early Wetherspoon pubs were also in the same part of Haringey. The J D Wetherspoon name comes from one of Martin's teachers in New Zealand who could not control his class, and said that Martin would never make it as a businessman.

In the early 1990s, Wetherspoon began a policy of routinely selling off their smaller and/or less profitable outlets, often—but not always—replacing them with larger premises very close by. There are now around 100 ex-Wetherspoon pubs, and none of the earliest outlets in the chain are still part of the estate. As of 2008, the oldest surviving Wetherspoon is the Rochester Castle in Stoke Newington, opened in 1983.