Atkinson Brass Company
- Specialisers in horn repair, customization and hand manufacturing
- http://www.atkinsonhorns.com

Finke Horns
- Hand crafted single, double, triple and natural horns.
- http://www.finkehorns.de/English/Index.html

Hatch Horns
- Custom made Geyer-style horns.
- http://www.weshatchhorns.com/

Moosewood
- Manufacturer of custom screw-rim mouthpieces and specialty items for the horn.
- http://www.hornmouthpiece.com/

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.
- http://www.deharohorns.com

Paxman Musical Instruments
- Makers of professional level horns; includes details about their range of horns, as well as dealer links.
- http://www.paxman.co.uk/system/index.html

M. Jiracek & Sons
- Czech maker of handcrafted single, double, descant, natural and Vienna horns.
- http://www.volweb.cz/jiracek/index.htm

Sorley's Horn Shop
- Maker of handcrafted custom F/Bb double horns, leadpipes and repair specialist.
- http://www.sorleyhorns.com

Dürk Horns
- Sells hand crafted single, double and triple horns, and accessories.
- http://www.duerkhorns.de/englisch/index.html

Clebsch Strap
- Maker of a horn support strap/hand guard system.
- http://www.clebschstrap.com/

Balu Inc.
- Maker of horn mutes, practice mutes, and mute bags.
- http://www.ionbalu.com/index.html

Seraphinoff, Richard
- Manufactures historical reproductions of Baroque and Classical natural horns.
- http://www.seraphinoff.com

Houser Mouthpiece Works
- Custom made mouthpieces, re-plating, threading and alterations.
- http://www.housermouthpiece.com

Alexander, Gebr.
- Horn makers. Site includes model pictures and details, as well as general information about the family business.
- http://www.gebr-alexander.com/

B.E.R.P
- Sells an invention called the Buzz Extension and Resistance Piece for mouthpiece buzzing/practicing.
- http://www.berp.com

Rocky Mountain Alphorns
- Sells handcrafted alphorns, alphorn sheet music and CD's.
- http://www.alphorn.ca

Osmun Music
- Specialize in selling brass instruments and accessories.
- http://www.osmun.com/

hornsAplenty
- Specialize in selling fully-reconditioned, professional models (Paxman, Alexander, Schmid) of used French horns.
- http://www.hornsaplenty.com/index.html

Thompson Edition, Inc.
- Horn cases, mouthpieces, mutes, sheet music, method books, and the "Thompson Edition": a collection of reprinted original orchestra parts.
- http://www.thompsonedition.com/

Robert Ostermeyer Musikedition
- Repertoire and sheet music for French Horn
- http://www.french-horn.com/english/

Holton
- A subsidiary of the Leblanc corporation, Holton manufactures "Farkas" and "Merker Matic" horns.
- http://www.gleblanc.com/

Yamaha
- Manufactures beginner, intermediate and professional/custom model horns.
- http://www.yamaha.com/yamahavgn/CDA/Home/YamahaHome/

TrumCor Mutes and Music
- Hand made mutes and stopping mutes, as well as some music for horn quartets and brass quintets.
- http://www.trumcor.com/

Kuehn, Ricco
- Hand made horns crafted in Germany by Ricco Kuehn including double Bb horns, single F horns, descant horns and Wagner tubas.
- http://www.ricco-kuehn.de/index.htm

Hoyer, Hans
- Official site (in English) for this professional horn maker. Includes descriptions of all professional and student model horns.
- http://www.hans-hoyer.de/index.htm

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.
- http://www.horncups.com

Lawson Brass Instruments
- Makers of professional quality horns. The site includes acoustical and general horn building information.
- http://www.lawsonhorns.com

Patterson Hornworks
- Makers of custom french horns and natural horns. Mouthpieces, leadpipes and complete restoration also available.
- http://hornworks.com/