- Group Name
- Old Line Independent Color Guard
- Hometown
- Frederick, MD
- Contact
- Walter Bryan Hirschmann
- Website
- https://www.oldlineindependent.org/
- https://www.facebook.com/oldlineperformingarts
- https://www.instagram.com/olicolorguard/
- Group Name
- Old Mill HS
- Hometown
- Millersville, MD
- Contact
- Alicia Simmons
- Group Name
- Olentangy HS
- Hometown
- Lewis Center, OH
- Contact
- Cindy Brun
- Website
- http://olentangyband.com
- Group Name
- Ollivier Middle School
- Hometown
- Bakersfield, CA
- Contact
- Alejandro Alcantar
- Website
- http://oms.gfusd.net
- http://www.facebook.com/7310 Monitor St.
- Group Name
- Olympia HS
- Hometown
- Orlando, FL
- Contact
- Jacob Pickett