Organizers
- BR Rocket Football and Cheerleading
- Bradley Baseball Academia
- Braintree Youth Soccer
- Brainy Bytes Cobb Cherokee
- Brandon Blue Fins Swim Club
- BrandywineBOTS
- Brazil in Chicago
- Brazilian United Soccer Academy
- Brazos Valley Museum of Natural History
- Breckenridge Recreation Department
- Brenau University
- Brett Smith Memorial Run
- Bridge City-Orangefield Rotary Club
- Bridgton Recreation
- Bright Sparks Events
- Bright Sparks Science CIC
- Bristol Henleaze SC
- Broadway Artists Alliance
- Broadway Dreams
- Broadway Workshop
- Broken Arrow Girls Softball League
- Brookfield Zoo Chicago
- Brookline Arts Center
- Brooklyn Arts Exchange, Inc
- Brooklyn Botanic Garden
- Broward Center for the Performing Arts
- Brownsburg Parks
- BSAC
- BSC-Freestyle Ice
- BSC-Learn to Skate
- BSLT Triathlon Inc
- BT3 Golf Academy
- Buckeye Elite Baseball & Softball
- Bucks County Tennis Association
- Bucks for Bucs
- Building Blocks, LLC
- Bulkley Valley Regional Pool & Recreation Centre
- Bulldog Baseball
- Bulldog Swim Camp
- Burbank First Academy
- Burnaby Barracudas Summer Aquatics Club
- Burnaby Mountain Mantas Swim Club
- Burnamwood Camp and Conference Center
- Bush Tennis Center
- Butler Montessori
- Butterfield Park District
- BW Community Arts School
- BW Community Arts School (17-21)
- BYU Sports Camps
