- Qualcomm Inc
- Qualcomm Ventures
- Qualicare Family Homecare
- Quality Care Properties
- Quality Care Services
- Quality in Real Time
- Quality Insights Quality Innovation Network
- Quantam Home Health Care
- Quantum Home Care Inc.
- Quest Diagnostics
- Questa Capital
- Question One
- Quil
- Quincy Medical Group
- RAB Ventures
- Railroad Retirement Board of Chicago
- Ralph C. Wilson Jr. Foundation
- RAND
- Rand Corp.
- RAND Corporation