2021 Australian Open – Wheelchair quad doubles

{{improve lead|date=September 2021}}

{{Infobox Tennis Grand Slam events|2021|Australian Open|s

| champ = {{flagicon|AUS}} Dylan Alcott
{{flagicon|AUS}} Heath Davidson

| runner = {{flagicon|GBR}} Andy Lapthorne
{{flagicon|USA}} David Wagner

| score = 6–2, 3–6, [10–7]

| before_name = Australian Open – Wheelchair quad doubles

| after_name = Australian Open – Wheelchair quad doubles

}}

{{main|2021 Australian Open}}

Three-time defending champions Dylan Alcott and Heath Davidson defeated Andy Lapthorne and David Wagner in the final, 6–2, 3–6, [10–7] to win the quad doubles wheelchair tennis title at the 2021 Australian Open.

For the first time in major history, the draw was increased from four to eight players.{{cite web|url=https://ausopen.com/articles/news/quad-wheelchair-draw-increased-grand-slam-first|title=Quad wheelchair draw increased in Grand Slam first|website=www.ausopen.com}} The wheelchair quad doubles competition, consisting of a semifinal round and a championship match, began on 15 February.{{cite web |title=Quad Wheelchair Doubles Draw {{!}} Australian Open |url=https://ausopen.com/draws#!quad-wheelchair-doubles |website=ausopen.com |access-date=15 February 2021}} It featured the same field of eight players contesting the singles competition. Two of the four pairs were seeded, with the Australian duo of Alcott and Davidson receiving the top seed and the pair of Lapthorne and Wagner getting the second seed. Both seeded pairs won their semifinal matches in straight sets; Alcott/Davidson defeated Sam Schröder/Niels Vink and Lapthorne/Wagner defeated Koji Sugeno/Nicholas Taylor.{{cite web |last=Beattie |first=Michael |title=Hewett beats Kunieda to set up Paris rematch with Gerard |url=https://www.itftennis.com/en/news-and-media/articles/hewett-beats-kunieda-to-set-up-paris-rematch-with-gerard/ |website=www.itftennis.com |access-date=15 February 2021}} The championship match, a rematch of the 2020 final, was held on 16 February with Alcott and Davidson winning in a match tiebreaker.{{cite web|title=Wheelchair wrap: Davidson, Alcott among doubles champs|url=https://ausopen.com/articles/news/wheelchair-wrap-davidson-alcott-among-doubles-champs|website=ausopen.com|date=16 February 2021|access-date=17 February 2021}}