- Companies - R
- Regional Development Authority of Northwest Indiana
- Resolute Affinity, Inc.
- River Valley Wireless, LLC
- Rolls Royce Controls and Data Services, Inc.
- RSA Security, Inc.
- Radius Indiana
- Risetter Accounting
- Raging Rocket Web Design
- River Tree Insurance
- RightFit Analytics, Inc.
- Rohde-Schwarz
- Reliable MicroSystems