Leetsdale is a borough in Allegheny County, Pennsylvania, along the Ohio River and is part of the Pittsburgh Metro Area. The population was 1,232 at the 2000 census.
The town has gained a certain popularity due to its name, a coincidence with Leetspeak, a common Internet sociolect. Leetsdale at one time had a formidable industrial manufacturing base with a Bethlehem Steel mill that closed in the late 1970s.
Leetsdale is located at 40°34′0″N 80°12′41″W / 40.566667°N 80.21139°W / 40.566667; -80.21139 (40.566667, -80.211274).