- Transplant for Life Foundation
- Transplant Recipients International Organization
- Transplant Services at UW Medical Center
- Transplant Speakers International, Inc.
- Transplant Success, Inc.
- Transplant Support Organization
- Transplant Surgery Center - HUH
- Transportation Management Services
- Transvision
- Transylvania Regional Hospital
- Transylvania University
- Travel Hero.com
- Travel Planners, Inc.
- Travel Portland
- Travel Tech, CMI and Instone Int
- Travelocity.com
- Travers Collins and Co.
- Traverse City CVB
- Traverse City University Center
- Travis County Medical Society
- Tree Care Industry Association
- Treelove
- Tri County Dental Association
- Tri Parish Rehabilitation Hospital
- Tri Star Skyline Medical
- Tri-City Area United Way
- Tri-City Medical Center
- Tri-Cor Industries, Inc.
- Tri-County Care Management, Inc.
- Tri-County Community Health Council
- Tri-County Health Care
- Tri-County Health System, Inc.
- Tri-County Kentucky United Way
- Tri-County Right to Life
- Tri-County United Way
- Tri-State Psychiatric Services
- Tri-Tech Electronics, Inc.
- Triangle Reprographics, Inc.
- Tribridge, Inc.
- Tribune Company
- TRICARE
- Trident
- Trident Health System
- Trident Insurance
- Trident Medical Center
- Trinitas Regional Medical Center
- Trinity Air Medical
- Trinity Baptist Church
- Trinity Health Systems
- Trinity Hospital