East Pittsburgh is a borough in Allegheny County, Pennsylvania, United States, approximately 11 miles (18 km) southeast of the confluence of the Monongahela and the Allegheny rivers at Pittsburgh.

George Westinghouse erected large works there which supplied equipment to the great power plants at Niagara Falls and for the elevated and rapid-transit systems of New York City. Nearby, the George Westinghouse Bridge over Turtle Creek is a prominent fixture in the area, which is very near the borough of Braddock.

The first transmission from pioneering radio station KDKA (AM) was made from East Pittsburgh on November 2, 1920.

In 1928, an early demonstration of a new broadcast medium was conducted at the Westinghouse laboratories in East Pittsburgh. Eventually, the new medium became known as television. Vladimir Zworykin worked for Westinghouse Electric Corporation at that time. He lived in the borough of Wilkinsburg. The Westinghouse Works became the Research and Business Park "Keystone Commons" in 1989.

East Pittsburgh has four borders, including Chalfant to the north, Turtle Creek to the northeast, North Versailles Township (via the Westinghouse Bridge or East Pittsburgh–McKeesport Blvd. Bridge) from the east to the southwest, and North Braddock to the west and northwest.

The population in 1900 stood at 2,883, and in 1910, at 5,615. As of the 2020 census, the borough population was 1,927,[4] having fallen from 6,079 in 1940. As of the 2000 census,the population was 2,017.