- Alabama Tennis Association - A district of the United States Tennis Association, Southern Section. Rankings, tournament results, and membership information.
- Ann Arbor Area Community Tennis Association - Describes the local facilities, board of directors, meeting details, a newsletter, related links, and how to get involved.
- ATP Tour - Official site for the organization overseeing the professional men's tour. Offers comments on players, results in tournaments, a calendar of events, and photos from tennis competitions.
- Bermuda Lawn Tennis Association - The governing body for tennis in Bermuda. Rankings, membership information, tournaments, and jobs listings.
- Canadian Tennis Association - The governing body of tennis for Canada. Rankings, tournaments, newsletters, and officiating. Site in English and French.
- EASI Tennis Certification - A tennis certification process that primarily focuses on tennis instruction.
- European Tennis Association - A collaboration of the member federations of 48 European countries to improve the representation of Europe in international tennis. Provides tournament administration, coaching, and publications.
- Great Britain Girls - A non profit group that provides financial assistance to promising young British girls.
- ITF: International Tennis Federation - Governing body provides information on players, national teams and competitions plus worldwide event calendars and entry forms, rules and regulations, and directory of regional and national groups. Includes wheelchair, junior and veterans tennis.
- Maine Tennis Association - The Maine district of the USTA New England section. Information on tournaments, USTA leagues, and clubs in Maine.
- National Capital Tennis Association - A local affiliate of Tennis Canada that covers Ottawa and the surrounding area. Local tennis news, tournament schedules, tennis club directory, and information on adult and junior tennis leagues.
- New Zealand Tennis - The governing body for tennis in New Zealand. Provides rankings and information on amateur and professional tournaments within the country.
- Nova Scotia Tennis Association - The Nova Scotia provincial affiliate of Tennis Canada. Lists officers, news, clubs, players forum, tournaments, links, frequently asked questions, and contact details.
- Parks Tennis Ireland - Provides various recreational tennis programs in parks throughout Ireland.
- Professional Tennis Registry - Provides education, certification, and services to tennis teachers and coaches around the world.
- South African Tennis Association - Governing Body for tennis in South Africa. Rankings for professional players and national amateur players from South Africa.
- Tencap Tennis - Allows managing leagues, tournaments, and for recreational players to rate themselves in local leagues.
- Tennis Avenue - Organises tennis leagues and tournaments for players of all ages and standards in Great Britain. Also trains and sponsors young aspiring players. Website offers tournament planning, latest rankings, results, chat, discussions, and webmail.
- Tennis for Africa Association - Charity association for helping African children through the promotion of tennis. Information on sponsors, news on activities, and auctions to raise money for the association. Site in English, Italian, and French.
- Tennis Ireland - The governing body for tennis in Ireland. Tournament calendar for amateur tournaments and contact information for members of the board of directors.
- Tennis Jamaica - The governing body of tennis in Jamaica. Rankings, calendar of events, player profiles, and tournament sanctioning information.
- Tennis Officials Australia - New South Wales Division - A non-profit association servicing the tennis officiating needs of New South Wales at professional to local events.
- Tennis Wales - The governing body of tennis in Wales, affiliated to the Lawn Tennis Association. Tournament results, tennis club directory, and information on recreational tennis leagues.
- Tennisforfree.com - A campaign to make all publicly managed tennis courts in the United Kingdom available for use for free.
- The Lawn Tennis Association - The governing body for the game of tennis in Great Britain. News, tournaments, rankings, member clubs directory, membership information, and coaching education.
- The Philadelphia Freedoms - The World Team Tennis team based in Philadelphia, Pennsylvania. Provides a roster, calendar, and tickets sales.
- Turkish Tennis Federation - Governing body of Tennis in Turkey. Player rankings, rules, and information on clubs and tournaments. Site in English and Turkish.
- United States National Tennis Academy - produces and administers a distance learning tennis instructor training and certification program. Covers details of the curriculumn and how to find one of their certified pros.
- United States Professional Tennis Association - An organization of US tennis teaching professionals. Offers playing tips, newswire, league and tournament information.
- United States Racquet Stringer's Association - A professional group for racquet stringers in the United States. Provides certification, instructional materials, and member registry for consumers.
- United States Tennis Association - Official site with tournaments, rankings, news, Davis Cup, Federation Cup, circuits, membership, and a library of resources.
- USTA Florida Section - The Florida Section of the United States Tennis Association. Tournament results, rankings, recreational tennis league information, and officiating certification information.
- USTA Intermountain Section Idaho District - The Idaho affiliate of the USTA. Provides information for tennis tournaments, clubs, and players, and rankings in Idaho.
- USTA Northern California Section - The Northern California section of the United States Tennis Association. Local tournament schedules and rankings.
- USTPA Little Tennis - The US Professional tennis association's youth outreach effort to get American children under the age of 12 to play tennis.
- World Team Tennis - A professional and amateur co-ed tennis league created by Billie Jean King. Membership applications for all levels of players as well as tennis equipment, clothing and other merchandise.
- WTA Tour - Governing body for women's tennis. Tournament draws, articles about the players, and history of the WTA.
