WMS Industries, Inc. was an American electronic gaming and amusement manufacturer in Enterprise, Nevada. It was merged into Scientific Games in 2016. WMS's predecessor was the Williams Manufacturing Company, founded in 1943 by Harry E. Williams. However, the company that became WMS Industries was formally founded in 1974 as Williams Electronics, Inc.

Williams initially was a manufacturer of pinball machines. In 1964, Williams was acquired by jukebox manufacturer Seeburg Corp. and reorganized as Williams Electronics Manufacturing Division. In 1973, the company branched out into the coin-operated arcade video game market with its Pong clone Paddle Ball, eventually creating a number of video game classics, including Defender, Joust, and Robotron: 2084. In 1974, Williams Electronics, Inc. was incorporated as a wholly owned subsidiary of Seeburg, which changed its name to Xcor International in 1977. Williams Electronics was spun out as an independent company in 1981.

In 1987, the company went public as WMS Industries, Inc. using a shortened version of its name which it also selected for its stock ticker symbol. In 1988, it acquired Bally/Midway, the amusement games division of Bally Manufacturing, which had decided to focus on its casino operating and manufacturing businesses. The video game operations were consolidated under the Midway name, while pinball machines continued to use the Williams and Bally names. After a string of arcade successes by Midway, WMS acquired Tradewest in 1994 to allow the company to publish its own home ports of arcade games directly, instead of licensing them to other publishers. Midway Games was taken public in 1996, and fully spun-off in 1998.

WMS created a subsidiary, WMS Gaming, for manufacturing gambling equipment in 1991. Beginning with video lottery terminals, the division introduced its first slot machines in 1994 and became a major player in the business. It closed its pinball division on October 25, 1999 after the Pinball 2000 concept that integrated a PC screen into the pinball game via a semi-reflective glass failed to meet sales expectations. In 2013, WMS became a wholly owned subsidiary of Scientific Games. In 2016, WMS was merged into Scientific Games, which renamed itself Light & Wonder in 2022.

Stanford engineering graduate Harry Williams entered the coin-operated amusement industry in 1933 and helped popularize several important pinball innovations such as the tilt mechanism, electrically-powered scoring holes, and the ability to win a free play by achieving a certain score. After working for a succession of companies including Pacific Amusement Manufacturing, Rock-Ola, and Exhibit Supply, he went into business with Lyndon Durant in 1942 under the name United Manufacturing. After a break with Durant, Williams founded the Williams Manufacturing Company in 1943 at 161 West Huron Street in Chicago, Illinois. The first seven products were a fortune-telling machine called Selector Scope (1944), two electro-mechanical (EM) games, Periscope (1944) and Liberator (1944), a novelty called Zingo (1944), a pinball conversion called Flat-Top (1945), another EM arcade game, Circus Romance (1945) and a second pinball conversion called Laura (1945). The two pinball conversions (Flat-Top & Laura) were built by purchasing older pinball machines made by other companies and changing artwork and other elements on the playfield. The lack of raw materials during World War II made the manufacture of new machines difficult and expensive. The first all original amusement device made by Williams was a flipperless pinball machine called Suspense (1946). During the late 1940s and early 1950s, Williams continued to make pinball machines and the occasional bat-and-ball game. In 1950, Williams produced Lucky Inning, their first pinball machine to have its bottom flippers facing inward in the modern manner.

In 1948, Williams sold 49% of his company to a Philadelphia distributor named Sam Stern, who became a vice president and took over much of the day-to-day running of the company. In 1959, Stern orchestrated a buyout of Williams by Consolidated Sun Ray, a New York retail conglomerate that operated drug stores and discount houses, which renamed the company the Williams Electronic Manufacturing Corporation. Harry Williams left after the buyout, though did occasional work for the company. The last game he designed for Williams was also one of the last electromechanical games, Rancho (1977).

In 1961, Stern bought Williams back from Consolidated Sun Ray. Three years later, the company was acquired by the Seeburg Corporation, which also purchased United Manufacturing. The two amusement companies were consolidated under the Williams name, but moved into the United factory. Sam Stern continued to run the amusement business, which was renamed Williams Electronics in 1967.

In 1962, 3 Coin became the best selling Williams machine with 1,100 units sold. One year later, Skill Pool sold 2,250 units. In 1964 Williams was purchased by the Seeburg Corporation. Its 1966 pinball machine A-Go-Go, with its avant-garde 60s theme, sold a record 5,100 units. Early Williams pinball machines often included innovative features and pinball firsts, such as mechanical reel scoring and the "add-a-ball" feature for locations that didn't allow game replays. By 1967, pinball was in the middle of its so-called "golden age", and the number of pinball units that sold began to increase dramatically. Popular Williams pinballs included Shangri-La (1967), Apollo (1967), Beat Time (1967), Smart Set (1969), Gold Rush (1971), and Space Mission (1976).