There are a great many unicycling organizations. There is one major international organization, many countries have their own organizations and there are some organizations for local areas. Many juggling clubs are accepting of unicycling.
International Unicycling FederationEdit
Hosted Unicon XII, in 2004. Unicycling is taught in many schools, hence Japan has the most unicyclists of any country in the world. An especial strength is performance, with easily the best group unicycle stage dance and performance groups in the world, consisting mostly of girls and young women.
The main unicycling group is Hong Kong Unicycling Club [], which primarily plays unicycle hockey but also goes offroad (muni) and for group rides. Some members are professional performers.
Unicycling Association of Hong Kong was founded on January 29 in 2016. This association aims to promote unicycling by sponsoring schools with unicycles and training coaches in Hong Kong. []
Singapore Unicyclist: The club plays hockey on a weekly basis and goes for road/muni rides. []
The Korea Unicycling Federation(KUF)  formed in 2001, has over 3,000 members. It is a nationwide union which represents Korea. They operate the biggest unicycle community web site from Korea. They participated unicon12(Japan)And unicon13(Switzerland). And unicon14 (Denmark) participates. They are active are world-wide. Contact lyn 
In Seoul, a number of clubs are affiliated under the Korea Unicycling Association. Korea Unicycling Association is federation of Taekwondo instructors [Taekwondo is korea martial art]. They are being active are continuous  (KUA), formed in 2006. The Association has a unicycle hockey team that recently played their first international match, as hosts against Hong Kong. Contact Lujianne  for details.
Danish unicycling clubs are members of DGI, the Danish Gymnastics and Sports Associations. DGI works to aid the local clubs and arranges national events such as the national championships.
The Italian Unicycle Association (AIM, Associazione Italiana Monociclo) was estabilished in September,2007 with the aim to promote unicycling in Italy and to coordinate unicyclists nationwide. Website: www.unicyclist.it (in Italian).
Unicycling club of Lithuania Unike.org established in 2005-2006.
Sweden and NorwayEdit
Unicyclists in Sweden and Norway are often members of Enhjulingsfolket - Enhjuling i scandinavien. Enhjulingsfolket is a an internet-based community that attempts to gather all types of unicyclists in a friendly environment and to coordinate conventions and unicycle weekends.
The Swiss Unicycling Federation (SUF) was formed in 2001. It supports organization of track racing and manages the swiss unicycle hockey league. The SUF recently hosted, with all the associated effort, Unicon XIII in Langenthal. More info at http://www.unicon13.ch/ More information about SUF and unicycling in Switzerland can be found at http://www.einradsport.ch/
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The Union of UK Unicyclists was established in 2001. It aims to promote unicycling throughout the UK. Union of UK Unicyclists
Australasia and OceaniaEdit
The New Zealand Unicycling Federation was incorporated as a society in 2004. The New Zealand Unicycling Federation (abbreviated to NZUni) organises the New Zealand Unicycling weekend and promotes unicycling within New Zealand. They coordinate the organization of NZUni weekend and nationals and muni weekends, as well as many unicycle meetings throughout the year. More information can be found on the NZUNi website http://www.unicycle.org.nz
The Australian Unicycling Society is the main unicycling organization in society. They coordinate the organization of uninats and muni weekends, as well as offer support to the Australian unicycling organizations that are affiliated with it. Their website is at http://www.unicycling.org.au/
Unicycling Association of the Northern Territory - http://www.unicyclingnt.com/
There's a bunch of riders that ride in Queensland, if you want to find some near you may check out and contact those who are based in Brisbane using www.unicycle.com.au riders list.
A group of unicyclists meet in small groups and are forming a larger group to arrange regular rides - any unicycling visitors are welcome to join in. for information contact Aubin at: email@example.com
There are two active unicycling groups in Victoria, one in Castlemaine and one in Melbourne. The Castlemaine group is incorporated under the name CACTUS, and the Melbourne group is at this stage only a loose affiliation of riders. Both groups meet regularly; the Melbourne group meets on the last sunday of most months outside the Melbourne Museum, between the museum and Nicholson St.
There is an active unicycling group that meets weekly around inner Perth. Anyone is welcome to join up for a ride. See http://perthunicycle.com for more information.
There's the club in Toronto, out of which came the famous Universe and Universe 2 videos of extreme unicycling.
The RTUC in Redford Michigan,hosting NAUCC 2012.
The Madison Unicyclists in Madison, WI. Hosted NAUCC 2011.
TCUC in the Twin Cities, MN. The largest club in the United States.
The CLUB in Leola,PA.
The Idiots On Unicycles (IOU's) Fallbrook, CA. (San Diego County)
Mad Skills Unicycle Club, Sarasota Florida. Started as a unicycle club, this organization has grow to include slack lining, juggling and many of the traditional circus skills. http://www.facebook.com/#!/profile.php?id=100001492730210