Alexander, Gebr.: Horn makers. Site includes model pictures and details, as well as general information about the family business.
Atkinson Brass Company: Specialisers in horn repair, customization and hand manufacturing
B.E.R.P: Sells an invention called the Buzz Extension and Resistance Piece for mouthpiece buzzing/practicing.
Balu Inc.: Maker of horn mutes, practice mutes, and mute bags.
Clebsch Strap: Maker of a horn support strap/hand guard system.
Dürk Horns: Sells hand crafted single, double and triple horns, and accessories.
de Haro Horns: Custom horn leadpipes, repairs, screwbell conversions, valve rebuilds, accessories, maintenance products, and replacement parts; tutorials for horn players and a suggested reading list.
Finke Horns: Hand crafted single, double, triple and natural horns.
Hatch Horns: Custom made Geyer-style horns.
Holton: A subsidiary of the Leblanc corporation, Holton manufactures "Farkas" and "Merker Matic" horns.
hornsAplenty: Specialize in selling fully-reconditioned, professional models (Paxman, Alexander, Schmid) of used French horns.
Houser Mouthpiece Works: Custom made mouthpieces, re-plating, threading and alterations.
Hoyer, Hans: Official site (in English) for this professional horn maker. Includes descriptions of all professional and student model horns.
Kuehn, Ricco: Hand made horns crafted in Germany by Ricco Kuehn including double Bb horns, single F horns, descant horns and Wagner tubas.
Lawson Brass Instruments: Makers of professional quality horns. The site includes acoustical and general horn building information.
M. Jiracek & Sons: Czech maker of handcrafted single, double, descant, natural and Vienna horns.
Moosewood: Manufacturer of custom screw-rim mouthpieces and specialty items for the horn.
Osmun Music: Specialize in selling brass instruments and accessories.
Patterson Hornworks: Makers of custom french horns and natural horns. Mouthpieces, leadpipes and complete restoration also available.
Paxman Musical Instruments: Makers of professional level horns; includes details about their range of horns, as well as dealer links.
Robert Ostermeyer Musikedition: Repertoire and sheet music for French Horn
Rocky Mountain Alphorns: Sells handcrafted alphorns, alphorn sheet music and CD's.
Schmid, Engelbert: Hand made horns, bells and mouthpieces. [German/English/French/Spanish]
Seraphinoff, Richard: Manufactures historical reproductions of Baroque and Classical natural horns.
Sorley's Horn Shop: Maker of handcrafted custom F/Bb double horns, leadpipes and repair specialist.
The PHC System of Horn Mouthpieces: All about the PHC System of French Horn screw-rim mouthpieces, including a forum section for horn players' messages.
Thompson Edition, Inc.: Horn cases, mouthpieces, mutes, sheet music, method books, and the "Thompson Edition": a collection of reprinted original orchestra parts.
TrumCor Mutes and Music: Hand made mutes and stopping mutes, as well as some music for horn quartets and brass quintets.
Yamaha: Manufactures beginner, intermediate and professional/custom model horns.