- Thomasville
- Thommen
- Thompson
- Thompson Traders
- Thompson's WaterSeal
- Thomson
- Thomson Broadcast & Multimedia
- Thomson Lighting
- Thon
- Thonet And Vander
- Thonet&Vander
- Thor
- Thor Digital
- Thor Kitchen
- THOR Technologies
- Thorbike
- Thorens
- Thorn
- Thorne Electric
- Thorpe Mill
- THQ Nordic
- Thrane & Thrane A/S
- Three D Traffic Works
- Throwback
- Thrush
- Thrustmaster
- Thrustmaster VG
- ThruWall
- Thuasne
- Thuka
- Thule
- Thulos
- Thumbs Up
- Thun
- Thunder
- Thunder Mount Systems
- THUNDER TIGER
- Thunder Tiger Corp.
- Thunderbird
- Thunderbird Products, Inc.
- Thunderbolt
- Thundercomm
- ThunderX3
- Thuraya
- Thursby Software
- THX
- Thyracont