- Telect
- Teledesign Systems
- Teledex
- Teledyne
- Teledyne API
- Teledyne e2v
- Teledyne Lecroy
- TeleEpoch
- TeleEye
- Telefield
- Teleflex
- TELEFONICA
- Telefunken
- Telegaertner
- Telegärtner
- Telegesis (UK)
- TELEGO
- Telekarta
- Telekom
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- Telematics Wireless
- Telematrix
- TELEMECANIQUE
- Telemecanique Sensors
- Telemotive
- Telemotive AG
- Telemotive Industrial Controls
- Telenet
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- TELENOR
- telenot
- Telensa
- TELEPHONE EST (HK)
- Telephonics
- TeleRed
- TelergyHD BV
- Telescopic Access
- Telesonic
- Telestar
- Telesteps
- Telesystem
- Teletech
- Teletrac
- Teletronics
- Teletronics International
- TeleType Company
- Televes