Peter Lilburn Hargett (December 12, 1852 – June 5, 1927) was an American politician and businessman.

Peter Lilburn Hargett was born on December 12, 1852, on a farm known as "Castle Henry" in Frederick County, Maryland to Eleanor (née Burns) and Samuel Hargett.

The silo they built received the first place award at Jamestown Exposition.

After his brother died in 1908, the business was reorganized as The Economy Silo and Manufacturing Company with Hargett as president and manager.

He was elected to the Maryland House of Delegates, representing Frederick County, from 1910 to 1914.