Pittsburgh ( PITS-burg) is a city in the Commonwealth of Pennsylvania and the county seat of Allegheny County. It is the most populous city in both Allegheny County and Western Pennsylvania, the second-most populous city in Pennsylvania after Philadelphia, and the 68th-most populous city in the U.S. with a population of 302,971 as of the 2020 census. The city anchors the Greater Pittsburgh metropolitan area of Western Pennsylvania; its population of 2.37 million is the largest in both the Ohio Valley and Appalachia, the second-largest in Pennsylvania, and the 27th-largest in the U.S. It is the principal city of the greater Pittsburgh–New Castle–Weirton combined statistical area that extends into Ohio and West Virginia.

Pittsburgh is located in southwest Pennsylvania at the confluence of the Allegheny River and the Monongahela River, which combine to form the Ohio River. Pittsburgh is known both as "the Steel City" for its dominant role in the history of the U.S. steel industry, and as the "City of Bridges" for its 446 bridges. The city features 30 skyscrapers, two inclined railways, a pre-revolutionary fortification and the Point State Park at the confluence of the rivers. The city developed as a vital link of the Atlantic coast and Midwest, as the mineral-rich Allegheny Mountains led to the region being contested by the French and British empires, Virginians, Whiskey Rebels, and Civil War raiders.

Aside from steel, Pittsburgh has led in the manufacturing of other important materials—aluminum and glass—and in the petroleum industry. Additionally, it is a leader in computing, electronics, and the automotive industry. For part of the 20th century, Pittsburgh was behind only New York City and Chicago in corporate headquarters employment; it had the most U.S. stockholders per capita. Deindustrialization in the 1970s and 1980s laid off area blue-collar workers as steel and other heavy industries declined, and thousands of downtown white-collar workers also lost jobs when several Pittsburgh-based companies moved out. The population dropped from a peak of 675,000 in 1950 to 370,000 in 1990. However, this rich industrial history left the area with renowned museums, medical centers, parks, research centers, and a diverse cultural district.

After 1990, Pittsburgh transformed into a hub for the health care, education, and technology industries. Pittsburgh is home to large medical providers, including the University of Pittsburgh Medical Center, Allegheny Health Network, and 68 colleges and universities, including research and development leaders Carnegie Mellon University and the University of Pittsburgh. Google, Apple, Bosch, Meta, Nokia, Autodesk, Amazon, Microsoft, and IBM are among some 1,600 technology firms with a presence in the city, generating $20.7 billion in annual Pittsburgh payrolls.

Federal money has supported the research agenda. The area has served as the federal agency headquarters for cyber defense, software engineering, robotics, energy research and the nuclear navy. The nation's fifth-largest bank, eight Fortune 500 companies, and six of the top 300 U.S. law firms make their global headquarters in the area, while RAND Corporation, BNY Mellon, Nova, FedEx, Bayer, and the National Institute for Occupational Safety and Health have regional bases that helped Pittsburgh become the sixth-best area for U.S. job growth.

In 2015, Pittsburgh was listed among the "eleven most livable cities in the world" by Metropolis magazine. The Economist's Global Liveability Ranking placed Pittsburgh as the most or second-most livable city in the United States in 2005, 2009, 2011, 2012, 2014, and 2018. The region is a hub for Leadership in Energy and Environmental Design and energy extraction.