Since the invention of the trolleybus, well over 200 different makers of trolleybuses have existed. This is a list of trolleybus manufacturers, both current and former.
Astra Bus (Romania)
Belkommunmash (Belarus)
VDL Berkhof (Netherlands)
Bogdan (Ukraine)
Bashkir Trolleybus Plant (BTZ), Ufa
BredaMenarinibusIT (Italy)
CAIO InduscarPT (Brazil)
DesignLine (New Zealand)
DINA (Mexico)
Dongfeng Yangtse (China)
Electrotrans-Service
Eletra Industrial Ltda (Brazil)
ELBO (Greece)
Foton Motor (China)
Fiat Group (Italy)
Iveco
Irisbus (with electrical equipment by Škoda)
Hess (Switzerland)
Liannex
LiAZ (Russia)
LuAZ (Ukraine)
LAZ (Ukraine)
Materfer (Argentina)
Mercedes-Benz (Germany)
MAZ (Belarus)
MTRZ
New Flyer Industries or Flyer Industries (Canada/USA)
Pyongyang Trolleybus Works (DPRK)
Scania AB (Sweden)
Škoda Electric (Czech Republic)
Solaris Bus & Coach (with electrical equipment by Ganz (owned by Škoda), DP Ostrava, CEGELEC, Vossloh-Kiepe and MEDCOM) (Poland)
SOR Libchavy (with electrical equipment by Škoda) (Czech Republic)
Sunwin (China)
Trans-Alfa (VMZ) (Russia)
Trolza, major producer in Russia
Ursus (Poland)
Van Hool (Belgium)
Volvo Buses (Sweden)
Youngman (China)
Yutong (China)
Zhongtong Bus
ZIU (Uritsky) – see Trolza
Alfa Romeo, Italy
AM General, USA
AnsaldoBreda and predecessors Ansaldo Trasporti and Breda Costruzioni Ferroviarie (but a related company, BredaMenarinibus, is still making trolleybuses), Italy
Aviant Aircraft Factory, Kiev, Ukraine
Associated Equipment Company, UK
Berna, Switzerland
British United Traction, UK
Brown Boveri & Company (using GM New Look bus body) for Edmonton, Canada
Busscar, Brazil
Canadian Car and Foundry, Canada
Chavdar, Bulgaria
Crossley Motors, UK
Daimler Motor Company, UK
Dennis Specialist Vehicles, UK
Electric Transit, Inc., USA-based joint venture
Fiat (subsidiary Irisbus is still manufacturing trolleybuses), Italy
FBW, Switzerland
Gräf & Stift, Austria
Guy Motors, UK
Henschel, Germany
Hispano-Suiza, Spain
Ikarus, Hungary
J.G. Brill, USA
Jelcz, Poland
Kawasaki (Japan)
Lancia, Italy
Leyland Motors, UK
Mafersa, Brazil
Marmon-Herrington, USA
Menarini, Italy – acquired by Breda in 1989, forming BredaMenarinibus
MASA (Mexicana de Autobuses SA) – now part of Volvo, Mexico
NAW, Switzerland
Neoplan, Germany
Neoplan USA
Pegaso, Spain
PTMZ, Russia
Praga, Czech Republic
Pullman-Standard, USA
Ransomes, Sims & Jefferies, UK
Richard Garrett & Sons, UK
Rocar, Romania
Saurer, Switzerland
Salvador Caetano, Portugal
St. Louis Car Company, USA
Socimi, Italy
Sunbeam, UK
Tatra, Czech Republic
Tushino Mechanical Plant, Russia
Twin Coach, USA
Valmet, Finland
Vétra, France
Viseon Bus, Germany (formerly Neoplan's trolleybus production)
Volgograd transport and machinery plant
Yaroslavl motor plant, Russia
YuMZ - Dnipropetrovsk, Ukraine
List of trolleybus manufacturers Wikipedia (Text) CC BY-SA