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John Austin (born July 31, 1957) is an American former professional tennis player born in Long Beach, California. He won the Wimbledon mixed doubles championship with his sister, Tracy Austin, in 1980, becoming the first brother and sister team to win a Grand Slam title together.

Austin reached a career high singles ranking of world No. 40. He now resides in Los Angeles with his son, Reed, and his wife, Karen. He is the brother of former professional tennis players Tracy, Pam, Jeff, and Doug Austin, and the brother-in-law of fitness expert Denise Austin.

According to a July 31, 2006 press release,

Grand Slam finals

Mixed doubles: 2 (1 title, 1 runner–up)

Result Year Championship Surface Partner Opponents Score
Win 1980 Wimbledon Grass United States Tracy Austin Australia Dianne Fromholtz
Australia Mark Edmondson
4–6, 7–6(8–6), 6–3
Loss 1981 Wimbledon Grass United States Tracy Austin Netherlands Betty Stöve
South Africa Frew McMillan
4–6, 7–6(7–2), 6–3