Organizers
- The Ridge at Castle Pines
- The Ridge GC
- The Ridge Run
- The Riding Therapy Center
- the River Club
- The River School
- The Riviera Ridge School
- The Rock Church and World Outreach Center
- The Rock Sports Park
- The Rockledge Club
- The Rocky Mountain Chapter of the Dalcroze Society of America
- The Ross Mullooly Project, Outrunning Cancer
- The Rotary Club of Hercules
- The Rotary Club of Moorpark
- The Royal British Legion
- The Royal Conservatory of Music
- The Royal Marsden Cancer Charity
- The RPM 911 Race
- The Run Above the Clouds
- The Run for John
- The Runner's Fairway Series
- The Runners Hub
- The Running Bee Foundation
- The Running Dead
- The Running School
- The Running Shop
- The S.C.O.R.E 4 Life Foundation
- The S.F. Experience
- The S.H.A.R.E. HOUSE
- The Salvation Army
- The Salvation Army Children's Services
- The Salvation Army Kroc Center
- The Salvation Army of Broward County
- The Salvation Army Ray and Joan Kroc Corps Community Center
- The Salvation Army, St. Petersburg Area Command
- The San Francisco Yacht Club
- The Sanctuary Golf Course
- The Sandbox Sunset Sports
- The Sarasota Y
- The Saturday Warriors
- The Savannah Golf Club
- The School of Practical Philosophy
- The Scott Law Foundation
- The Scottish Mountain Bike Consortium
- The Second City Training Center
- The Second City Training Centre Toronto
- The Semper Fi 5K
- The ShamRock 'n Roll Road Race
- The Shawnee Inn and Golf Resort
- The Shelton Companies
