Alonzo Harding Mourning, Jr. (born February 8, 1970, in Chesapeake, Virginia) is an American professional basketball player who plays for the NBA's Miami Heat.
Known simply as "Zo", Mourning plays at center and is tall, and weighs . His tenacity on defense twice earned him NBA Defensive Player of the Year Award and perennially placed him on the NBA All-Defensive Team. He is applauded for making a comeback after undergoing a kidney transplant and years later winning his first NBA Championship with the Heat. He has also played for the Charlotte Hornets and New Jersey Nets.
Mourning and his wife Tracy have one son, Alonzo III ("Trey"), and a daughter, Myka Sydney.
In the 1994-95 season, Mourning and teammate Larry Johnson elevated the Hornets to a 50-win season and took them to the playoffs. Mourning ranked first on the team in scoring (21.3 ppg), rebounding (9.9 rpg), blocked shots (2.92 per game), and field goal percentage (.519).
In the 1997 NBA Playoffs, with the Heat down 3-0 to the Chicago Bulls in the Eastern Conference Finals, Mourning guaranteed a victory in Game 4. The Heat won the Game 87-80, but the Heat lost in five. The next season, Miami would be eliminated in the first round by the Knicks, a series in which Mourning was suspended for the 5th and deciding game of due to an on-court fight with ex-teammate Larry Johnson where Knicks Head Coach Jeff Van Gundy wound up hanging onto Mourning's leg in an attempt to break it up. Miami would also be eliminated by the Knicks in the playoffs the following two seasons.
In 2000, Miami underwent an overhaul to attempt to put together the pieces to win a championship, and expectations leading up to the season were high. However, prior the start of the 2000-01 season, Mourning was diagnosed with focal segmental glomerulosclerosis, a disease of the kidneys, that had caused him to miss the first five months of that season. Even after the diagnosis, Mourning returned and played in the 2002 NBA All-Star Game. Because his condition worsened, Mourning did not play during the entire 2002-03 season and his expiring contract was not renewed by the then-rebuilding Heat.
Mourning was traded to the Toronto Raptors on December 17, 2004. Mourning never reported to the Raptors as he was bought out of his contract, at a remaining 9 million dollars, on February 11, 2005.Raptors team officials later said that he did not meet the medical conditions to play for the team. Mourning then finished the season with the Miami Heat being paid a second salary, the veteran's minimum.
The Miami Heat and Mourning finally won the elusive NBA Championship in the 2006 NBA Finals against the Dallas Mavericks 4 games to 2. Although he was used as a reserve center behind Shaquille O'Neal during the Finals, he contributed 8 points, 6 rebounds, and 5 blocks in the decisive Game 6 of the series and was a strong force throughout.
After winning the championship, Mourning announced that he would return to the Heat in 2006-07 to defend their title, despite receiving offers of more money from other teams, including the San Antonio Spurs. In 2007, Mourning announced he would return for one more year with the Heat and his 15th season. "It will definitely be my last year", Mourning said. After starting the season on a solid note averaging 6 points, 3.8 rebounds and 1.75 blocks in just over 16 played per 24 games, Mourning tore his patellar tendon in his right knee on December 19 during the first quarter of a 117-111 OT loss in Atlanta. The injury, which occurred on the fourth anniversary of his successful kidney transplant, was said to be career-threatening, but rumors have persisted about a return come the 2008-2009 season, and Mourning himself said that this wasn't the way he wanted to end his career considering all he had been through already.
Currently Mourning has averaged the most blocks in the NBA per 48 minutes with 5.46.
During the 2007-08 season, he became the Heat's all-time leader in points scored.
Mourning received Cooper's left kidney on December 19, 2003.
After being diagnosed with focal glomerulosclerosis (FSGS), a degenerative kidney ailment, at the start of the 2000-2001 season, Mourning launched Zo’s Fund for Life, a campaign which seeks to raise funds for research, education, and testing to fight focal glomerulosclerosis. Funds are allocated toward research for a cure, education for doctors and the general public, testing for early detection and a fund for those not able to afford medication.
In 2007, Alonzo Mourning along with Andre Agassi, Muhammad Ali, Lance Armstrong, Warrick Dunn, Mia Hamm, Jeff Gordon, Tony Hawk, Andrea Jaeger, Jackie Joyner-Kersee, Mario Lemieux, and Cal Ripken Jr. founded Athletes for Hope, a charitable organization, which helps professional athletes get involved in charitable causes and inspires millions of non-athletes to volunteer and support the community.

|- | align="left" | 1992–93 | align="left" | Charlotte | 78 || 78 || 33.9 || .511 || .000 || .781 || 10.3 || 1.0 || .3 || 3.5 || 21.0 |- | align="left" | 1993–94 | align="left" | Charlotte | 60 || 59 || 33.6 || .505 || .000 || .762 || 10.2 || 1.4 || .4 || 3.1 || 21.5 |- | align="left" | 1994–95 | align="left" | Charlotte | 77 || 77 || 38.2 || .519 || .324 || .761 || 9.9 || 1.4 || .6 || 2.9 || 21.3 |- | align="left" | 1995–96 | align="left" | Miami | 70 || 70 || 38.2 || .523 || .300 || .685 || 10.4 || 2.3 || 1.0 || 2.7 || 23.2 |- | align="left" | 1996–97 | align="left" | Miami | 66 || 65 || 35.2 || .534 || .111 || .642 || 9.9 || 1.6 || .9 || 2.9 || 19.8 |- | align="left" | 1997–98 | align="left" | Miami | 58 || 56 || 33.4 || .551 || .000 || .665 || 9.6 || .9 || .7 || 2.2 || 19.2 |- | align="left" | 1998–99 | align="left" | Miami | 46 || 46 || 38.1 || .511 || .000 || .652 || 11.0 || 1.6 || .7 || 3.9 || 20.1 |- | align="left" | 1999–00 | align="left" | Miami | 79 || 78 || 34.8 || .551 || .000 || .711 || 9.5 || 1.6 || .5 || 3.7 || 21.7 |- | align="left" | 2000–01 | align="left" | Miami | 13 || 3 || 23.5 || .518 || .000 || .564 || 7.8 || .9 || .3 || 2.4 || 13.6 |- | align="left" | 2001–02 | align="left" | Miami | 75 || 74 || 32.7 || .516 || .333 || .657 || 8.4 || 1.2 || .4 || 2.5 || 15.7 |- | align="left" | 2003–04 | align="left" | New Jersey | 12 || 0 || 17.9 || .465 || .000 || .882 || 2.3 || .7 || .2 || .5 || 8.0 |- | align="left" | 2004–05 | align="left" | New Jersey | 18 || 14 || 25.4 || .453 || .000 || .593 || 7.1 || .8 || .3 || 2.3 || 10.4 |- | align="left" | 2004–05 | align="left" | Miami | 19 || 3 || 12.9 || .516 || .000 || .564 || 3.7 || .2 || .2 || 1.7 || 5.0 |- | align="left" | 2005–06 | align="left" | Miami | 65 || 20 || 20.0 || .597 || .000 || .594 || 5.5 || .2 || .2 || 2.7 || 7.8 |- | align="left" | 2006–07 | align="left" | Miami | 77 || 43 || 20.4 || .560 || .000 || .601 || 4.5 || .2 || .2 || 2.3 || 8.6 |- | align="left" | 2007–08 | align="left" | Miami | 25 || 0 || 15.6 || .547 || .000 || .592 || 3.7 || .3 || .2 || 1.7 || 6.0 |- | align="left" | Career | align="left" | | 838 || 686 || 31.0 || .527 || .247 || .692 || 8.5 || 1.1 || .5 || 2.8 || 17.1 |- | align="left" | All-Star | align="left" | | 4 || 1 || 18.8 || .545 || .000 || .667 || 4.8 || 1.0 || .8 || 2.0 || 10.0 |}
|- | align="left" | 1992–93 | align="left" | Charlotte | 9 || 9 || 40.8 || .480 || .000 || .774 || 9.9 || 1.4 || .7 || 3.4 || 23.8 |- | align="left" | 1994–95 | align="left" | Charlotte | 4 || 4 || 43.5 || .421 || .500 || .837 || 13.3 || 2.8 || .8 || 3.2 || 22.0 |- | align="left" | 1995–96 | align="left" | Miami | 3 || 3 || 30.7 || .486 || .000 || .714 || 6.0 || 1.3 || .7 || 1.0 || 18.0 |- | align="left" | 1996–97 | align="left" | Miami | 17 || 17 || 37.1 || .491 || .375 || .555 || 10.2 || 1.1 || .6 || 2.7 || 17.8 |- | align="left" | 1997–98 | align="left" | Miami | 4 || 4 || 34.5 || .518 || .000 || .655 || 8.5 || 1.3 || .8 || 2.5 || 19.3 |- | align="left" | 1998–99 | align="left" | Miami | 5 || 5 || 38.8 || .521 || .000 || .653 || 8.2 || .8 || 1.6 || 2.8 || 21.6 |- | align="left" | 1999–00 | align="left" | Miami | 10 || 10 || 37.6 || .484 || .000 || .667 || 10.0 || 1.4 || .2 || 3.3 || 21.6 |- | align="left" | 2000–01 | align="left" | Miami | 3 || 3 || 30.3 || .480 || .000 || .579 || 5.3 || 1.0 || .0 || 1.7 || 11.7 |- | align="left" | 2004–05 | align="left" | Miami | 15 || 2 || 16.9 || .705 || .000 || .558 || 4.8 || .3 || .3 || 2.2 || 6.1 |- | align="left" | 2005–06 | align="left" | Miami | 21 || 0 || 10.8 || .703 || .000 || .667 || 2.9 || .1 || .2 || 1.1 || 3.8 |- | align="left" | 2006–07 | align="left" | Miami | 4 || 0 || 13.8 || .909 || .000 || .385 || 2.0 || .3 || .0 || .8 || 6.3 |- | align="left" | Career | align="left" | | 95 || 57 || 27.3 || .512 || .368 || .649 || 7.0 || .9 || .5 || 2.3 || 13.6 |}