- Tadpole
- Taiwan Commate
- Tandon
- Tandy
- Tangent
- Targa
- Tarng Bow
- Tatung
- TEAC
- Techmedia
- Technoland
- Teknor
- Tekom
- Tekram
- Tektronix Printer Memory
- Telexon
- Terra Soft Solutions
- Texas Instruments (TI)
- Texas Micro
- Thomson
- Tiga
- Time
- Tiny Computers
- TMC
- Toshiba Memory
- Totem
- Touchstar
- Tracer
- Trademark
- Transcend
- Transmonde
- Trg
- Trigem
- Trimble
- Trinity
- Trogon
- Trust
- Tul
- Tulip
- Twinhead Notebook Memory
- TwinMos
- Tyan Computers
