- Hitachi Europe srl
- Hitalos
- Hitch Mylius
- Hitch Mylius Ltd
- Hi-Tec Lighting&Engineering
- HI-TECH Impianti
- Hi-Tech Outsourcing Services
- HI-TECH SOLUZIONI ELETTRICHE
- HITECH SYSTEMS, SRL
- hitechbuilding
- Hiten Chitroda
- HI-TIDE
- HITIT SERAMIK SAN.TIC. A.S.
- Hitrac Engineering Group
- Hitzig Militello Arquitectos
- Hive
- HIYOSHIYA CO.,LTD.
- Hizone by ISA
- Hjellegjerde Europe GmbH
- Hjort Knudsen A/S
- HK Associates
- HK INSTRUMENTS OY
- HK LIZHI SEATING LIMITED
- HK Studio
- HKI - Industrieverband Haus-, Heiz- und Küchentechnik e.V.
- HKP International
- HKP International
- HKP International
- HKR Architects
- HKS Dreh-Antriebe GmbH
- Hl hutterer & lechner GMBH
- HLM Interiors
- HM CONSTRUCTION
- HM CONSTRUCTION SRL
- HM NEGOCE
- HM RADIATEURS FRANCE
- HMA2 Architects
- HMD ARCHITECTURES
- HMD Arredi
- HMD INTERIORS
- HMLarchitecture
- hmproject