- Teleway Industrial
- Telewell
- Telex
- Telfort
- Telguard
- Telian
- TELINK
- Telit
- Telit Communications S.p.A.
- Telit Mobile Terminals S.p.A.
- Telit Wireless Solutions
- Telit Wireless Solutions GmbH
- Telkonet
- Tell
- Tell Manufacturing
- TELL ME MORE
- Telldus
- Telltale Games
- Tellur
- Tellus Group Corp.
- Tellus Technology
- TELME
- TELNET
- Telnova Technology
- Telonics
- Telos
- Telos Alliance
- Telrad
- Telrad Networks
- TELSDA
- TelSKY
- Telson Electronics
- Telson Information and Communications
- Telstar
- Telstra
- Telstrat
- Teltonika
- TELTONIKA Networks
- Teltronic S.A.U.
- Telular
- Telus
- Telwin
- Tely Labs
- TEM
- TemaHome
- Temco Japan
- TEMIUM