Wheelchair tennis is one of the forms of tennis adapted for wheelchair users. The size of the court, net height, rackets, are the same, but there are two major differences from pedestrian tennis: athletes use specially designed wheelchairs, and the ball may bounce up to two times, where the second bounce may also occur outside the court.
Wheelchair tennis is played at Grand Slams, and is one of the sports contested at the Summer Paralympics. There are three categories; Men, Women, and Quads; each category has singles and doubles tournaments. The Quad Division is for players that have substantial loss of function in at least one upper limb, but may include various disabilities other than quadriplegia. The division is sometimes called Mixed, especially at the Paralympic Games. Quad players often tape the rackets to their hand, to compensate for loss of function, and some players are allowed to use electric-powered wheelchairs.
Wheelchair tennis increased in popularity in 1976 due to the efforts of Brad Parks, who is seen as the creator of competitive wheelchair tennis. In 1982, France became the first country in Europe to put a wheelchair tennis program in place. Since then, much effort has been made to promote the sport at the elite-level.
The sport quickly became popular worldwide and was introduced to the Paralympic Games as a demonstration event at the Seoul 1988 Summer Paralympics. In 1990, wheelchair tennis was played alongside the able-bodied players' event in Miami. This continued for more than 15 years. It was at the 1992 Summer Paralympics in Barcelona that wheelchair tennis acquired the status of a full-fledged competition. The 2000 Summer Paralympics in Sydney boosted public appreciation immensely and led to the introduction of the sport to the four annual Grand Slams of Tennis. In 2004, after the efforts of Rick Draney, the Quad category was added to the Paralympic Games.
The Wheelchair Tennis Class 8s at the 2002 Australian Open saw competitive wheelchair tennis take place at the same time and the same venue at a Grand Slam for the first time. In 2005 the Masters series was created, comprising all the events at the Grand Slams and the end of year championships, as Wimbledon and the US Open joined Melbourne. In 2007 Roland Garros joined and the Classic 8s were replaced by the Australian Open which had been held at the same venue two weeks later. In 2009 all events played at the able-bodied players' Grand Slams were renamed Grand Slams.
The Netherlands has dominated numerous victories at major tournaments including the Paralympic Games and the Grand Slams.
For the 2013 season the ITF decided to adopt match tiebreakers in place of a third and deciding set in doubles matches. However the tiebreaker would only be used at events which were rated as ITF1 or lower and at the World Team Cup. The grand slams, however, were free to decide on the format of their tournaments.
The ITF Wheelchair Tennis Tour consists of international tournaments with different grades and prize money. The wheelchair tennis tournaments are graded by the ITF. Total prize money for the tour in 2016 was over $2million.  The wheelchair tennis tour includes the following types of tournaments:
The four Grand Slam –Australian Open, Wimbledon, Roland Garros, and US Open– include a wheelchair tennis draw. Only the US Open and Australian Open offer a quad draw so far, and only four Quad players are invited (as opposed to eight for men and women). In November 2017 it was announced that a Quad Wheelchair Doubles Exhibition match will be played in Wimbledon in 2018. 
The Super Series events include the Sydney Open (Sydney), Cajun Classic (Baton Rouge), British Open (Nottingham), Japan Open (Iizuka), US Open (St. Louis) and French Open (Paris, BNP Paribas Open de France). The ITF publishes a year-long calendar with all tournaments and their respective grades. 
The ITF BNP Paribas World Team Cup is a wheelchair tennis tournament for national teams, held annually since 1985. The BNP Paribas World Team Cup World Group event is played once a year, for men, women, quads and juniors. There are four continental qualification events in Europe, Africa, Asia and Americas, in which men and women compete to qualify for the main event. 
The last two major tournaments of the year are the Wheelchair Tennis Masters  (singles event) and Uniqlo Wheelchair Doubles Masters . The top eight men, top eight women and top six quads based on ranking are invited to compete there each year.
Wheelchair tennis is played at the Paralympic Games and FESPIC games as well.
- International Tennis Federation. "Rules of Wheelchair Tennis". Retrieved 2012-07-08.
- Bullock, Mark. "CSD" (PDF).
- International Tennis Federation. "About Wheelchair Tennis". Retrieved 2012-07-08.
- ITF Tennis Wheelchair http://www.itftennis.com/wheelchair/organisation/history.aspx. Retrieved 3 March 2015. Missing or empty
- International Paralympic Committee. "'88 Seoul Paralympics: General Information". Retrieved 2011-07-12.
- Glenday, Craig (2013). Guinness World Records 2014. ISBN 978-1-908843-15-9.
- "Wimbledon announces Quad Wheelchair Doubles Exhibition". www.wimbledon.com. Retrieved 16 April 2018.
- International Tennis Federation: Wheelchair Tennis
- International Paralympic Committee: Wheelchair Tennis
- United States Tennis Association: Wheelchair Tennis
- Tennis Foundation (Great Britain): Wheelchair Tennis
- BBC Gloucestershire feature on the 2007 National Wheelchair Tennis Championships in Gloucester.
- History of Wheelchair Tennis