William Steinway (1835-1896), born Wilhelm Steinweg, was a German-American piano manufacturer and former president of Steinway & Sons. The company was founded by William's father, Henry E. Steinway, shortly after the family moved from Germany to New York City in the early 1850s. William took over Steinway & Sons in the 1870s after the death of his father and two of his brothers.

Steinway was a generous patron of the New York opera and orchestra companies, as well as touring European musicians. His investments in the arts and innovative print advertisements led to the construction of Steinway Hall in Manhattan and other halls worldwide. In the 1870s, Steinway relocated the company's operations to what is now northern Astoria, Queens, after purchasing a home, Steinway Mansion, and the surrounding property to establish a company town, Steinway Village. The Steinway Mansion and Steinway Piano Factory still stand, and many nearby buildings bear the Steinway name.

As one of New York City's leading industrialists, Steinway's developments included the transportation industry. One of his former resorts east of Astoria became LaGuardia Airport; he was a partner in the American production of Daimler AG/Maybach cars, and served as head of the New York Subway Commission. Steinway wanted to expand his Steinway Railway Company, a trolley system for his workers under the East River. Steinway died in 1896 before the completion of tunnels and subway line. The Steinway Tunnels under the East River and the Astoria subway station Steinway St were named in his honor.