BRFC
- Baglan RFC
- Bala RFC
- Balbriggan RFC
- Ballincollig RFC
- Ballymacash Rangers F.C.
- Ballymena R.F.C.
- Ballynahinch RFC
- Ballywalter Recreation F.C.
- Banbridge RFC
- Banbridge Rangers F.C.
- Bangalore rugby football club
- Bangor RFC
- Bannockburn RFC
- Banwen RFC
- Bargoed RFC
- Barking Rugby Football Club
- Barnes Rugby Football Club
- Barnhall RFC
- Barnstaple RFC
- Barry RFC
- Barton Rovers F.C.
- Basingstoke R.F.C.
- Beckenham Rugby Football Club
- Beddau RFC
- Bedlinog RFC
- Bedwas RFC
- Berwick RFC
- Berwick Rangers F.C.
- Bethesda RFC
- Bettws RFC
- Betws RFC
- Biggar RFC
- Billericay Rugby Football Club
- Birchgrove RFC
- Birr RFC
- Birstall RFC
- Blackburn Rovers F.C.
- Blackwood RFC
- Blaenavon RFC
- Blaina RFC
- Blaydon RFC
- Bonymaen RFC
- Boroughmuir RFC
- Boston RFC (England)
- Boston RFC (United States)
- Bournville RFC
- Boyne RFC
- Bracknell RFC
- Brecon RFC
- Bridon Ropes F.C.
- Brightlingsea Regent F.C.
- Brimsdown Rovers F.C.
- Brisbane Roar FC
- Bristol Rovers F.C.
- British Record (Rod Caught) Fish Committee
- Bromsgrove RFC
- Bromsgrove Rovers F.C.
- Brora Rangers F.C.
- Bruff R.F.C.
- Bryncethin RFC
- Bryncoch RFC
- Brynithel RFC
- Brynmawr RFC
- Burnham Ramblers F.C.
- Burton RFC