Henry Clay Loudenslager (May 22, 1852 – August 12, 1911) was an American Republican Party politician from New Jersey who represented the 1st congressional district from 1893 to 1911.

Loudenslager was born in Mauricetown, New Jersey (now part of Commercial Township) on May 22, 1852.

He moved with his parents to Paulsboro, New Jersey in 1856, where he attended the common schools.

Loudenslager was elected as a Republican to the Fifty-third and to the nine succeeding Congresses and served from March 4, 1893, until his death in Paulsboro on August 12, 1911.

This article incorporates public domain material from the Biographical Directory of the United States Congress