Stephen Joseph Hardin (October 27, 1946 – June 28, 2015) was an American songwriter, keyboardist, and harmonica and clavinet player.

He was probably best known as the writer of top-ten country hits "I Love My Truck" (#10, Glen Campbell) and "Breakin' Down" (#10, Waylon Jennings), although his diverse career included performing tours with Point Blank, Glen Campbell and Steppenwolf; a seven-year gig in a south Florida Reggae band; and a solo CD with backup vocals by Gretchen Wilson.

Hardin played in bands in Dallas, Oklahoma City and Tulsa in the late 1960s and early 1970s before joining Point Blank as a keyboard man in 1977.

[citation needed] While back in L.A. with Steppenwolf, Hardin learned that Glen Campbell was wanting to hire a full-time writer for his records, tours, and T.V.

From there he moved on to Nashville's Bourbon Street Blues and Boogie Bar, where he was the keyboardist for Stacy Mitchhart and Blues-U-Can-Use.