Nathan Leroy Strong (November 12, 1859 – December 14, 1939) was a Republican member of the U.S. House of Representatives from Pennsylvania.

Born in Troy (now Summerville), Jefferson County, Pennsylvania on November 12, 1859, Nathan L. Strong worked as a telegraph operator and railroad agent from 1877 to 1894.

He studied law, was admitted to the bar in 1891 and commenced practice in Brookville, Pennsylvania, in 1893.

He was then engaged in the development of mineral lands in Jefferson and Armstrong Counties from 1901 to 1916, and served as president of the Mohawk Mining Company.

Strong was elected as a Republican to the Sixty-fifth and to the eight succeeding Congresses.