- Oak Partners, Inc.
- Oak Ridge Prairie
- Office of Faith-Based and Community Initiatives
- Office of Governor Eric J. Holcomb
- Office of Lt. Governor Suzanne Crouch
- Ogden Dunes Women's Club
- Olga Granat
- Olivia Dybing
- Olivia Oster
- Olivia Pierce
- Olivia Wright
- On Coming Alive
- One Guy With Tools
- One Portage
- Operation Feed LaPorte County
- Opportunity Enterprises
- Orr Fellowship
- Oscar Meyer
- Our Community Inc.
- Our Greater Good
- Outback Trail at Imagination Glen
- Overhead Door Of Northwest Indiana™
- Ozinga