- Hartmann and Blume
- Hartmann Möbelwerke GmbH
- Hartmann Tresore Italia
- Hartmann-Thoma plan werk GmbH
- Hartnagel Handels GmbH
- HARTÔ
- harunatsu-arch
- Harvard Engineering Plc.
- Harvink
- HAS - Hinterland Architecture Studio
- HAS design and research
- HAS Schuhböck
- HASCON ENGINEERING
- HASCON ENGINEERING spa
- Hase Kaminofenbau GmbH
- Hasena AG
- Haser Metallbau GmbH, Abt. TZK
- HASH
- Hashimoto Yukio Design Studio
- Haskell
- HASLER
- hasler
- Hasler
- Hasler
- HASLER TRANS SRL - GMBH
- HASLEV
- HASMATIK
- HASPO sstem s.r.o.
- Hassell
- Hasslacher Norica Timber
- HÄSTENS - Alkmaar
- HÄSTENS - Amersfoort
- HÄSTENS - Amersham
- HÄSTENS - Amsterdam
- HÄSTENS - Ankara
- HÄSTENS - Assen
- HÄSTENS - Augsburg
- HÄSTENS - Barcelona Carrer de Ganduxer
- HÄSTENS - Barcelona Carrer de Muntaner
- HÄSTENS - Bari
- HÄSTENS - Beijing
- HÄSTENS - Berlin
- HÄSTENS - Birmingham