GTech Corporation was a gaming technology company based in Providence, Rhode Island, United States. It was acquired in 2006 for $4.5 billion by Lottomatica of Italy, which later rebranded as GTECH in the U.S. GTECH subsequently acquired International Game Technology (1975–2015) (IGT) in 2015, adopting International Game Technology (IGT) as its business name. Lottomatica also retained its brand from Italy, and operates several other subsidiaries.

GTech was founded by Guy S. Snowden, Victor Markowicz and Robert Stern in 1981. The company was financed with $200,000 from the founders and an equal amount invested by the Bass Brothers, to whom Snowden had close ties, with their long-time advisor Richard Rainwater. The outside investors also arranged a bank guarantee of $3 million for the fledgling company, and saw the original $200,000 investment grow to $40 million within 15 years of GTech's launch. In that same year, 1996, an extensive investigation by Fortune magazine revealed that few companies have "faced as many allegations of baldly sleazy conduct as Gtech."

In 1998, GTech founder Snowden, then chairman, lost a defamation suit brought by Richard Branson concerning Snowden's attempt to bribe him to withdraw The People's Lottery from bidding on the operation contract for the UK's National Lottery. Subsequently, Snowden was forced to resign from GTech and as a shareholder in the Camelot Group. In 2000, GTECH reported that it had won 80% of all online lottery contracts worldwide since 1996, and held about 70% of the global market in online gaming.

In 2005, GTech was operating 26 of the 36 U.S. state lotteries, and the D.C. Lottery. A year later, it was acquired by Italian gaming operator Lottomatica for $6.4 billion, then operated as its U.S. subsidiary. Five years later, in 2011, Lottomatica reported revenues of €3 billion, with 8,000 employees in more than 60 countries.

In 2007, The New York Times reported "persistent allegations of bribing their way into contracts" from government regulators and court filings.

Lottomatica changed its U.S. subsidiary name to GTECH, in 2013, stylizing it with all capital letters.

In 2015, GTECH, formerly GTech, merged with International Game Technology (1975–2015) (IGT), while agreeing "to pay a fine of over $40 million to the Italian authorities to settle intercompany financing activities and alleged tax evasion that occurred during a previous merger in 2006, between Gtech and its buyer, Italy-based Lottomatica", which continues operating under the Lottomatica brand, with several subsidiaries, and is listed on Euronext Milan of Borsa Italiana. The company rebranded again, adopting International Game Technology (IGT) as its new name.

Richard Branson prevailed in court in a defamation lawsuit against GTECH cofounder Snowden, whom he claimed had offered him a bribe to withdraw "The People's Lottery" 1994 non-profit bid to run the UK's first franchise for the National Lottery, in which GTECH won an integral role through Camelot Group. Snowden denied the bribery claim and was met by Branson's suit, which succeeded in 1998.