Killing Machine (US title: Hell Bent for Leather) is the fifth studio album by Judas Priest. The album was Judas Priest's first stab at a "different" sound, and was created at about the same time that the band members adopted their now-famous "leather-and-studs" style.

"Killing Machine" was retitled "Hell Bent for Leather" for Stateside release, as the US branch of Columbia/CBS did not like the "murderous implications" of the album title. Additionally, the track "The Green Manalishi (With the Two-Pronged Crown)", an early Fleetwood Mac cover, was added to the running order: it was not on the UK release.

The album was remastered in 2001, with two bonus tracks added. The bonus track "Fight for Your Life" was the "original" version of Judas Priest's "Rock Hard Ride Free" from their Defenders of the Faith album.

The Killing Machine (1964) is the second of Jack Vance's "Demon Princes" novels, in which Kirth Gersen, having brought arch-villain Malagate the Woe to justice, sets his sights on Kokor Hekkus, another of the Demon Princes. The nickname does not refer to Hekkus's own predilection for homicide, but to his fondness for horrific and murderous devices, including a giant robotic executioner that first gained him his nickname.