Joshua Fiero Jr. (May 4, 1818 - March 1, 1886) was an American merchant and politician from New York.
He was born in that part of the Town of Broome which was separated in 1836 to form the Town of Conesville, in Schoharie County, New York.
At age 9, he went to Saugerties, Ulster County, New York, to live with his uncle Joshua Fiero who adopted him.
On July 28, 1842, he married Mary Frances Pierson (1820–1907), and they had several children, among them State Senator William P. Fiero (1843–1912).
He died at his home in Catskill, and was buried at the Village Cemetery there.