Langeloth is a census-designated place in Smith Township, Washington County, Pennsylvania, United States. Langeloth has been assigned the ZIP code 15054. As of the 2010 census the population was 717 residents.
Langeloth began as a coal mining company town. Langeloth has three businesses; Vallina's Market, Riddell/All American, and Langeloth Metallurgical Company, now a unit of Thompson Creek Metals. It is also the birthplace of noted former college football coach Barry Alvarez. Langeloth is also home to the regionally renowned Langeloth Softball League, also known as LSB. Games are played at the Gus Barbush Memorial park where hundreds of locals gather to drink beer outside the outfield fence. The league slogan is, "We play fastpitch."