Hennessey Guitar Parts is a guitar accessory brand owned by The Music People (TMP), the Connecticut-based distributor that also operates the On-Stage stands brand. The line focuses on hardware upgrades and replacement parts for electric and acoustic guitars, with strap locks as the brand's most visible category.

The lineup centers on three strap lock series: the NSL7200 traditional locking buttons, the NSL7300 Metallics with anodized aluminum finishes in colors such as red, blue, purple, gun metal, and black, and the NSL8200 Euro-Lok premium line featuring a wingnut and plunger locking mechanism. Each system uses a compress-and-release action and ships with a felt washer to protect the guitar finish from the metal hardware. The Metallics series was reviewed favorably in Premier Guitar's August 2009 strap lock roundup.

Beyond strap locks, Hennessey produces a broader catalog of fretted instrument accessories distributed through major retailers including Guitar Center, Musician's Friend, Music & Arts, zZounds, and Reverb. The brand sits alongside On-Stage in TMP's portfolio of stage and instrument hardware aimed at working musicians and project-grade builders.

Hennessey Guitar Parts has 1 product cataloged on Equipboard, including Straps & Strap Locks.