Organizers
- The Club@Crossgates
- The Clubhouse
- The Clubs at River City
- The Clubs of Prestonwood
- The Coastal Challenge
- The Cody G Richardson Memorial Scholarship Foundation
- The Coliseum Sports Complex
- The Collaboratory
- The College at Brockport Sport Management Club
- The College Career Ready Academy
- The Colony Roadrunners Club
- The Color Dash
- The Color Run
- The Color Run CAD
- The Color Run IMG Canada
- The Color Run Pty Ltd
- The Comedy Lab
- The Comedy Project
- The Committee for the Great Salt Pond
- The Common School Summerfun
- The Common School: Auxiliary Programs
- The Community Foundation of Middle Tennessee
- The Community House
- The Community School at Cape Cod Tech
- The Connection LLC
- The Connection Reward, Inc. / The Sports Fans Connection - Brad
- The Connection Reward, Inc. / The Sports Fans Connection - Ed
- The Connection Reward, Inc. / The Sports Fans Connection - Michael
- The Conor Lynch Foundation
- The Contemporary Austin Art School
- The Cooking Castle
- The Cornerstone School
- The Corporation of Quinte West
- The Cottage
- THE COTTAGE SCHOOL
- The Council of Irish Associations of Greater Bergen County
- The Country Blues Run
- The Country Club of Ashland
- THE COUNTRY CLUB OF MIAMI
- The County of Prince George
- The Courses at Watters Creek
- The Courts of NWI
- The Craig OHern Golf School
- The Crazy Wine Dash
- The Creative GRP, LLC
- The Creek at Hard Labor Golf Course
- The Crescent Beach Swimming Club
- The Crossings GC
- The Crossings Swim Team
- The Crown and Sash Dash
