John Nathan Hostettler (born June 19, 1961), is a Republican former member of the United States House of Representatives. Hostettler (pronounced HOH-stet-luhr) served six consecutive two-year terms, from January 3, 1995 to January 3, 2007, representing the 8th District of Indiana (map).

He lost his reelection bid for a seventh term to Democratic challenger Brad Ellsworth in the 2006 midterm election, ending a twelve-year Congressional career.

Hostettler was born in Evansville, Indiana, as the eighth of ten children. He is of Swiss German descent. He grew up in rural Posey County near the Ohio and Wabash rivers.