Politics and Business magazines
- Thomaston Mills, Inc.
- Thomsen Greenhouses and Garden Center, Incorporated
- THOMSON multimedia S.A.
- Thomson S.A.
- Thor Industries, Inc.
- Thorn Emi Plc
- Thorn plc
- Thorntons plc
- ThoughtWorks Inc.
- Thousand Trails, Inc.
- THQ, Inc.
- Thrifty PayLess, Inc.
- Thyssen Krupp AG
- TI Group plc
- Tibbett & Britten Group Plc.
- TIBCO Software Inc.
- Ticketmaster Corp.
- TIG Holdings, Inc.
- Tiger Aspect Productions Ltd.
- Tilcon-Connecticut Inc.