- B-Love Kandy (Cricket)
- B36 Torshavn (Football)
- B93 (Football)
- Ba11sy Trichy (Cricket)
- Backa Topola (Football)
- Badureliya Sports Club (Cricket)
- Bagh Stallions (Cricket)
- Bahamas (Football)
- Bahawalpur Region (Cricket)
- Bahawalpur Royals (Cricket)
- Bahçeşehir Basketbol (Basketball)
- Bahrain (Football)
- Bahrain (Cricket)
- Bahrain (Handball)
- Bahrain Women (Cricket)
- Bakhram Murtazaliev (Boxing)
- Bala Town FC (Football)
- Ball State (American Football)
- Ball State (Basketball)
- Ballkani (Football)
- Ballymena United (Football)
- Balochistan (Cricket)
- Balochistan 2nd XI (Cricket)
- Baltimore Orioles (Baseball)
- Baltimore Ravens (American Football)
- Balzan FC (Football)
- Banbury (Football)
- Bangla Tigers (Cricket)
- Bangla Tigers Mississauga (Cricket)
- Bangladesh (Cricket)
- Bangladesh (Football)
- Bangladesh A (Cricket)
- Bangladesh A Women (Cricket)
- Bangladesh Cricket Board Green (Cricket)
- Bangladesh Cricket Board Red (Cricket)
- Bangladesh Cricket Board XI (Cricket)
- Bangladesh Emerging Team (Cricket)
- Bangladesh High Performance Squad (Cricket)
- Bangladesh Legends (Cricket)
- Bangladesh Team Green (Cricket)
- Bangladesh Team Red (Cricket)
- Bangladesh Under-19s (Cricket)
- Bangladesh Women (Cricket)
- Bangladesh Women Emerging Players (Cricket)
- Bangladesh Women Under-19s (Cricket)
- Bangladesh XI (Cricket)
- Bangladeshis (Cricket)
- Banks O'Dee (Football)
- Barbados (Tennis)
- Barbados (Netball)
- Barbados (Football)
- Barbados (Cricket)
- Barbados Cricket Association President's XI (Cricket)
- Barbados Royals (Cricket)
- Barbados Royals Women (Cricket)
- Barbados Tridents (Cricket)
- Barbados Women (Cricket)
- Barbarian Women (Rugby Union)
- Barbarians (Rugby Union)
- Barcelona (Football)
- Barcelona Femení (Football)
- Barisal Division (Cricket)
- Barishal T20 (Cricket)
- Barmy Army Women (Cricket)
- Barnet (Football)
- Barnsley (Football)
- Barnsley Women (Football)
- Baroda (Cricket)
- Baroda Women (Cricket)
- Barrackpore Bashers (Cricket)
- Barrow (Football)
- Barrow Raiders (Rugby League)
- Barry Town (Football)
- Basel (Football)
- BATE Borisov (Football)
- Bath Rugby (Rugby Union)
- Bath United (Rugby Union)
- Batley Bulldogs (Rugby League)
- Bauhinia Stars Women (Cricket)
- Bay FC (Football)
- Bay Of Plenty (Rugby Union)
- Bay of Plenty Volcanix (Rugby Union)
- Bayer 04 Leverkusen (Football)
- Bayern Munich (Football)
- Bayern Munich (Basketball)
- Bayern Munich Women (Football)
- Baylor (Basketball)
- Baylor (American Football)
- Bayonne (Rugby Union)
- Bayswater City (Football)
- BC Lions (Canadian Football)
- Bears (Cricket)
- Bears Women (Cricket)
- Beatriz Ferreira (Boxing)
- Beaumont Park Ladies (Football)
- Bedford Blues (Rugby Union)
- Bedfordshire (Cricket)
- Bedfordshire and Huntingdonshire Women (Cricket)
- Beerschot AC (Football)
- Beerschot VA (Football)
- Beijing Guoan (Football)
- Beijing Renhe (Football)
- Beitar Jerusalem (Football)
- Beith Juniors (Football)
- Bektemir Melikuziev (Boxing)
- Belarus (Football)
- Belarus (Tennis)
- Belarus (Ice Hockey)
- Belarus U21 (Football)
- Belarus Women (Football)
- Belarus Women (Basketball)
- Belenenses SAD (Football)
- Belfast Giants (Ice Hockey)
- Belfast Titans (Cricket)
- Belgium (Football)
- Belgium (Tennis)
- Belgium (Basketball)
- Belgium (Hockey)
- Belgium (Handball)
- Belgium (Rugby Union)
- Belgium (Volleyball)
- Belgium U21 (Football)
- Belgium Women (Football)
- Belgium Women (Basketball)
- Belgium Women (Hockey)
- Belgium Women (Volleyball)
- Belize (Football)
- Belmont (Basketball)
- Ben Askren (Boxing)
- Ben Whittaker (Boxing)
- Benburb (Football)
- Bendigo Spirit (Basketball)
- Benetton Rugby (Rugby Union)
- Benevento (Football)
- Benfica (Football)
- Benfica Women (Football)
- Bengal (Cricket)
- Bengal Women (Cricket)
- Bengaluru Blasters (Cricket)
- Benin (Football)
- Berkshire (Cricket)
- Berkshire Women (Cricket)
- Bermane Stiverne (Boxing)
- Bermuda (Football)
- Bermuda (Cricket)
- Bermuda (Rugby Union)
- Bernabe Concepcion (Boxing)
- Berwick Rangers (Football)
- Beşiktaş (Football)
- Beşiktaş Women (Basketball)
- Bethune-Cookman (American Football)
- Bexcy Mateus (Boxing)
- Beximco Dhaka (Cricket)
- Bezawada Tigers (Cricket)
- Béziers (Rugby Union)
- Bhilwara Kings (Cricket)
- Bhutan (Cricket)
- Bhutan Women (Cricket)
- Biarritz Olympique (Rugby Union)
- Bihar (Cricket)
- Bihar Women (Cricket)
- BIIK Kazygurt Women (Football)
- Billericay Town (Football)
- Billericay Town Women (Football)
- Billy Joe Saunders (Boxing)
- Birkirkara FC (Football)
- Birmingham & West Midlands Ladies (Football)
- Birmingham City (Football)
- Birmingham City Women (Football)
- Birmingham Panthers (Netball)
- Birmingham Phoenix (Cricket)
- Birmingham Stallions (American Football)
- Bishops Lydeard Ladies (Football)
- Bishops Stortford (Football)
- BK Häcken (Football)
- BK Häcken Women (Football)
- Black Ferns XV (Rugby Union)
- Black Lion (Rugby Union)
- Blackburn Rovers (Football)
- Blackburn Rovers Women (Football)
- Blackburn United (Football)
- Blackpool (Football)
- Blackpool Ladies (Football)
- Blacktown City FC (Football)
- Bloomfield Cricket and Athletic Club (Cricket)
- Blues (Rugby Union)
- Bnei Yehuda Tel Aviv (Football)
- Bo'ness Athletic (Football)
- Bo'ness United (Football)
- Boavista FC (Football)
- Boca Juniors (Football)
- Boca Raton Trailblazers (Cricket)
- Bochum (Football)
- Bodø/Glimt (Football)
- Bodrum FK (Football)
- Bogdan Dinu (Boxing)
- Bohemians (Football)
- Bohemians 1905 (Football)
- Boise State (American Football)
- Boise State (Basketball)
- Boland (Cricket)
- Boland Cavaliers (Rugby Union)
- Boland Women (Cricket)
- Boldmere St Michaels Ladies (Football)
- Bolivia (Football)
- Bolivia (Tennis)
- Bologna (Football)
- Bolton Wanderers (Football)
- Bombay Deccan (Cricket)
- Bonnyrigg Rose (Football)
- Bonnyrigg Rose Ladies (Football)
- Borac (Football)
- Bordeaux (Football)
- Bordeaux Bègles (Rugby Union)
- Border (Cricket)
- Border Women (Cricket)
- Boreham Wood (Football)
- Borussia Dortmund (Football)
- Borussia Mönchengladbach (Football)
- Bosnia and Herzegovina (Football)
- Bosnia and Herzegovina (Tennis)
- Bosnia and Herzegovina (Basketball)
- Bosnia and Herzegovina (Handball)
- Bosnia and Herzegovina U21 (Football)
- Bosnia and Herzegovina Women (Football)
- Bosnia and Herzegovina Women (Basketball)
- Boston (Ice Hockey)
- Boston Bruins (Ice Hockey)
- Boston Celtics (Basketball)
- Boston College (American Football)
- Boston Common Golf (Golf)
- Boston Fleet (Ice Hockey)
- Boston Pride (Ice Hockey)
- Boston Red Sox (Baseball)
- Boston United (Football)
- Botafogo (Football)
- Botev Plovdiv (Football)
- Botswana (Football)
- Botswana Women (Cricket)
- Bournemouth Sports Ladies (Football)
- Bournemouth Women (Football)
- Bowers & Pitsea (Football)
- Bowers & Pitsea Ladies (Football)
- Bowling Green (American Football)
- Brackley Town (Football)
- Bracknell Town (Football)
- Brad Foster (Boxing)
- Brad Pauls (Boxing)
- Bradford Bulls (Rugby League)
- Bradford City (Football)
- Bradford City Women (Football)
- Bradley (Basketball)
- Braintree Town (Football)
- Brampton Wolves (Cricket)
- Brandon Adams (Boxing)
- Brandon Figueroa (Boxing)
- Brandon Rios (Boxing)
- Brann (Football)
- Brann Women (Football)
- Bravo (Football)
- Brazil (Football)
- Brazil (Tennis)
- Brazil (Rugby Union)
- Brazil (Basketball)
- Brazil (Rugby League)
- Brazil (Volleyball)
- Brazil (Handball)
- Brazil (Baseball)
- Brazil U20 (Football)
- Brazil Women (Football)
- Brazil Women (Basketball)
- Brazil Women (Volleyball)
- Brazil Women (Rugby Union)
- Brazil Women (Cricket)
- Brechin City (Football)
- Breiðablik (Football)
- Breidablik Women (Football)
- Brentford (Football)
- Brentford Women (Football)
- Brescia (Football)
- Brest (Football)
- Brian Castano (Boxing)
- Brian Mendoza (Boxing)
- Bridgwater United FC Women (Football)
- Brighouse Town Ladies (Football)
- Brighton and Hove Albion (Football)
- Brighton and Hove Albion U21 (Football)
- Brighton and Hove Albion Women (Football)
- Brisbane Bullets (Basketball)
- Brisbane City FC (Football)
- Brisbane Heat (Cricket)
- Brisbane Heat Women (Cricket)
- Brisbane Lightning (Ice Hockey)
- Brisbane Lions (Australian Rules Football)
- Brisbane Roar FC (Football)
- Brisbane Strikers (Football)
- Bristol Bears (Rugby Union)
- Bristol Bears A (Rugby Union)
- Bristol Bears Women (Rugby Union)
- Bristol City (Football)
- Bristol City Women (Football)
- Bristol Flyers (Basketball)
- Bristol Rovers (Football)
- Bristol Rovers Women (Football)
- British & Irish Lions (Rugby Union)
- British Virgin Islands (Football)
- Brive (Rugby Union)
- Broadbeach (Australian Rules Football)
- Bromley (Football)
- Bromley Ladies (Football)
- Broncos (Rugby League)
- Broncos Women (Rugby League)
- Brøndby IF (Football)
- Brøndby IF Women (Football)
- Brooklyn Nets (Basketball)
- Broomhill (Football)
- Brora Rangers (Football)
- Brothers Union (Cricket)
- Broxburn Athletic (Football)
- Brumbies (Rugby Union)
- Brunei (Football)
- Bruno's Magpies (Football)
- Bryant (Basketball)
- Bryant University (American Football)
- Bryne (Football)
- Brython Thunder (Rugby Union)
- BSC Glasgow Women (Football)
- BSC Young Boys Bern (Football)
- Buakaw Banchamek (Boxing)
- Buckie Thistle (Football)
- Buckinghamshire (Cricket)
- Buckinghamshire Women (Cricket)
- Bucknell (American Football)
- Bucks (Cricket)
- Budapest Honved (Football)
- Buducnost Podgorica (Football)
- Buffalo (Basketball)
- Buffalo (American Football)
- Buffalo Beauts (Ice Hockey)
- Buffalo Bills (American Football)
- Buffalo Sabres (Ice Hockey)
- Bulawayo Braves (Cricket)
- Bulgaria (Football)
- Bulgaria (Tennis)
- Bulgaria (Volleyball)
- Bulgaria (Basketball)
- Bulgaria U21 (Football)
- Bulgaria Women (Football)
- Bulgaria Women (Volleyball)
- Bulldogs (Rugby League)
- Bulldogs Women (Rugby League)
- Bulls (Rugby Union)
- Bulls XI (Cricket)
- Burgher Recreation Club (Cricket)
- Burkina Faso (Football)
- Burnley (Football)
- Burnley Women (Football)
- Burntisland Shipyard (Football)
- Bursaspor (Football)
- Bursledon Ladies (Football)
- Burton Albion (Football)
- Burundi (Football)
- Bury (Football)
- Buxton (Football)
- BYU (American Football)
- BYU (Basketball)