Stanley Black & Decker, Inc., formerly known as The Stanley Works, is a Fortune 500 American manufacturer of industrial tools and household hardware and provider of security products and locks headquartered in the greater Hartford city of New Britain, Connecticut. Stanley Black & Decker is the result of the merger of Stanley Works and Black & Decker on March 12, 2010.

The company came to existence as a direct result of the 1920 merger of Stanley's Bolt Manufactory, founded by Frederick Trent Stanley in 1843, and the Stanley Rule and Level Company, founded by Frederick's cousin, Henry Stanley, in 1857.

During World War II, Stanley Works received the Army-Navy "E" Award for excellence in war production.

In May 2002, the company considered moving its corporate headquarters to Bermuda, but public and governmental outcry forced management to reconsider the move. By August 2002, the company had decided to maintain its incorporation in the United States.

John F. Lundgren was elected as chairman and chief executive officer in 2004, replacing John Trani, a former protégé of Jack Welch at General Electric.

The Hardware & Home Improvement Group, including the Kwikset, Weiser, Baldwin, National Hardware, Stanley, FANAL, Pfister and EZSET brands, was acquired by Spectrum Brands Holdings, Inc. on December 17, 2012.

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This focuses on electronic security systems and related services. A reorganization of Stanley Security Solutions, Stanley Correctional Systems and Healthcare Solutions resulted in a unified non-hardware business unit.

These are physical access systems and associated hardware, including automatic doors, electronic keyless entry systems, locking mechanisms and related keying systems.

These were sold to Spectrum Brands in 2012.

This was sold to MAT Holdings in 2011.