Andrew Carnegie (properly pronounced /kɑrˈneɪɡi/, but commonly /ˈkɑrnɨɡi/ or /kɑrˈnɛɡi/) (25 November 1835 – 11 August 1919) was a Scottish-born American industrialist, businessman, and a major philanthropist. He was an immigrant as a child with his parents. He built Pittsburgh's Carnegie Steel Company, which was later merged with Elbert H. Gary's Federal Steel Company and several smaller companies to create U.S. Steel. With the fortune he made from business, he turned to philanthropy and interests in education, founding the Carnegie Corporation of New York, Carnegie Endowment for International Peace, and Carnegie Mellon University in Pittsburgh and the Carnegie Museums of Pittsburgh.

Carnegie gave away most of his money to establish many libraries, schools, and universities in America, the United Kingdom and other countries, as well as a pension fund for former employees. He is often regarded as the second-richest man in history after John D. Rockefeller. Carnegie started as a telegrapher and by the 1860s had investments in railroads, railroad sleeping cars, bridges and oil derricks. He built further wealth as a bond salesman raising money for American enterprise in Europe.

Steel was where he made his fortune. In the 1870s, he founded the Carnegie Steel Company, a step which cemented his name as one of the “Captains of Industry”. By the 1890s, the company was the largest and most profitable industrial enterprise in the world. Carnegie sold it to J.P. Morgan in 1901, who created US Steel. Carnegie devoted the remainder of his life to large-scale philanthropy, with special emphasis on local libraries, world peace, and education and scientific research. His life has often been referred to as a true "rags to riches" story.