John Packer Ltd is a British brass and woodwind manufacturer and retailer based in Wellington, Somerset. The company was founded by John Packer, a musician and trained instrument maker who apprenticed with London oboe makers Howarth before opening his own repair and retail shop in the late 1970s. The JP-branded instrument line launched with the Portland oboe in 1999 and has since grown into a global catalogue with hundreds of thousands of instruments in circulation across more than 40 countries.

The JP range covers the full brass and woodwind families — trumpets, cornets, flugelhorns, French horns, trombones, baritones, euphoniums, tubas, and marching brass, alongside clarinets, flutes, piccolos, saxophones, oboes, bassoons, and English horns. Higher-tier signature variants are developed in collaboration with established UK and US makers, including Smith-Watkins (Dr. Richard Smith) on models such as the JP251SW Bb trumpet, Rath Trombones (Michael Rath), Sterling Musical Instruments (Paul Riggett), and Taylor Trumpets (Andy Taylor). Popular models in the catalogue include the JP175 flugelhorn and the JP-172 alto/tenor horn.

JP instruments are widely used in British brass band, school music, and step-up student markets, where the brand is positioned between entry-level imports and full pro-level European brass on price and serviceability. Players publicly associated with the brand include trombonists Carol Jarvis, Michael Dease, and Brett Baker, along with euphoniumist Robb Tooley.

John Packer has 2 products cataloged on Equipboard, including Bassoons and Baritone & Bass Saxophones. Their gear is featured by 1 artist, with the strongest followings in Rock. Notable users include Nicholas Matthews.