- Trimble Navigation
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- Trimble Outdoors
- TRIMFINITY
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- Trimod Besta
- TRIMOS
- Trinamic
- TRINAMIC / ANALOG DEVICES
- TRINITY
- TRINITY JOIN
- TRINITY PRO
- Trinus Systems
- Trio
- Trio Datacom Pty Ltd (a wholly owned company of Schneider Electric)
- TRIOBIKE
- TRIOMPH
- Trion
- Triotronik
- Tripar International, Inc.
- Triple C Designs
- Triple Clear
- Triple E
- Triple Plus
- Triple S
- Triplett
- Triplett Test Equipment and Tools
- TRIPLETT:Triplett
- TRIPLEX
- Tripp Lite
- Tripp-Lite
- Trisa
- Trisa Electronics
- Trisia
- Trisk
- TriSquare
- Trisquare Communications
- Tristar
- Tristar Products
- TRITAN BP
- Tritec
- Tritech
- TriTeq