Baseball
- BabeRuth Baseball, Inc: http://www.baberuthleague.org
- International Baseball Association (IBA): http://www.alpcom.it/digesu
- Major League Baseball: http://www.majorleaguebaseball.com
- Minor League Baseball: http://www.minorleaguebaseball.com
- Charlie Rose Baseball: http://www.charlierosebaseball.com/
- Little League Baseball: http://www.littleleague.org/
- USSSA Baseball (United States Specialty Sports Association): www.usssabaseball.org
Boxing
- Association of Boxing Commissions (ABC): http://www.abcboxing.com/
Basketball
- Fédération Internationale de Basketball Association (FIBA): http://www.fiba.com
- German speaking basketball officials: http://www.basketball-schiedsrichter.de
- National Basketball Association (NBA): http://www.nba.com
- Women’s National Basketball Association (WNBA): http://www.nba.com/wnba
- USA Basketball: http://www.usabasketball.com
- International Association Approved Basketball Officials (IAABO): http://www.iaabo.org
Cycling
- Union Cycliste Internationale (UCI): http://www.uci.ch
- USA Cycling Online: http://www.usacycling.org
Fencing
- Fédération Internationale d’Escrime (Fencing) (FIE): http://www.fie.ch/
- Fencing Official’s Commission: http://www.fencingofficials.org
Field Hockey
- Fédération Internationale de Hockey (FIH): http://www.fihockey.org/
Football (American)
- Tom Beard’s Football Officials Clinic: http://www.tbfoc.org
- National Football League (NFL): http://www.nfl.com
- Canadian Football League (CFL): http://www.cfl.ca
Golf
- Professional Golfers Association (PGA): http://www.pga.com/
- United States Golf Association (USGA): http://www.usga.org/
- Ladies Professional Golf Association (LPGA): http://www.lpga.com/
- PGA Tour (PGA): http://www.pgatour.com/
Ice Hockey
- International Ice Hockey Federation (IIHF): http://www.iihf.com/
- National Hockey League (NHL): http://www.nhl.com
Ice Skating (Figure Skating, Speed Skating, etc.)
- International Skating Union (ISU): http://www.isu.org
Judo
- International Judo Federation (IJF): http://www.ijf.org
Lacrosse
- Nassau County Lacrosse Officials Association http://www.ncloa.org
- New Hamphsire Lacrosse Officials Association http://www.nhloa.org
- US Lacrosse http://www.uslacrosse.org
Modern Pentathlon & Biathlon
- International Biathalon Union: http://www2.biathlonworld.com/en/
- International Pentathalon Federation: http://www.pentathlon.org/
Netball
- The International Federation of Netball Associations (IFNA): http://www.netball.org
Powerlifting (Weight Lifting)
- International Powerlifting Federation (IPF): http://www.powerlifting-ipf.com/
Rowing (Crew)
- Fédération Internationale des Sociétés d’Aviron (FISA): http://www.fisa.org
- U.S. Rowing: http://www.usrowing.org/
Rugby
- International Rugby Board (IRB): http://www.irb.com/
Sailing
- International Sailing Federation (ISAF): http://www.sailing.org
Skiing (Snow)
- Fédération Internationale de Ski (FIS): http://www.fis-ski.com/
- Canadian Cross Country: http://www.cccski.com
- United States Skiing: http://www.usskiteam.com
Soccer (Football)
- Fédération Internationale de Football (FIFA): http://www.fifa.com
- Major League Soccer: http://www.majorleaguesoccer.com
- Metropolitan Washington Soccer Referees Association: http://www.mwsra.org/links.html
- National Intercollegiate Soccer Officials Association: http://www.nisoa.com
- United States Soccer Federation: http://www.ussoccer.com
Softball
- National Softball Association: http://members.aol.com/nsamd/index.htm
- National Softball Association of the Deaf: http://www.nsad.org/
- BC Softball: http://www.softball.bc.ca/
- The Amateur Softball Association: http://www.softball.org
Squash
- The World Squash Federation: http://www.squash.org
Swimming, Diving, & Water Polo
- Fédération Internationale de Natation Amateur (FINA): http://www.fina.org
Table Tennis
- International Table Tennis Federation (ITTF): http://www.ittf.com/
Taekwondo
- The World Taekwondo Federation (WTF): http://www.wtf.or.kr/
Team Handball
- USA Team Handball: http://www.usateamhandball.org
Tennis (Lawn)
- Fédération Internationale de Tennis (ITF): http://www.itftennis.com
Track & Field
- USA Track & Field: http://www.usatf.org
Triathlon
- International Triathlon Union (ITU): http://www.triathlon.org
Volleyball
- Fédération Internationale de Volley-Ball (FIVB): http://www.fivb.ch/
- Volleyball Canada : http://www.volleyball.ca/
- Professional Association of Volleyball Officials (PAVO): www.pavo.org
- USA Volleyball: http://www.usavolleyball.org
- USA – Volleyball World Wide: http://www.volleyball.org
Water Skiing
- International Water Ski Federation (IWSF): http://www.iwsf.com
- American Water Ski Association: http://www.usawaterski.org/