Leechburg is a borough in southern Armstrong County in the U.S. state of Pennsylvania, 35 miles (56 km) northeast of Pittsburgh.

[3] Leechburg was founded by David Leech, for whom it was named, and was incorporated as a borough in 1850.

Located along the Kiskiminetas River, Leechburg was a major port of the Pennsylvania Canal.

Early in the 20th century, it was the site of extensive steel sheet works, foundries, cement plants, and productive coal mines.

Current officials and when their terms expire are: Leechburg is in Pennsylvania's 15th congressional district, represented in Congress by Rep. Glenn Thompson (R).

Leech purchased the land from a local Native American known as White Maddock.