Joseph Isaac Schooling PJG (born 16 June 1995) is a Singaporean former[3] professional swimmer who specialised in butterfly, freestyle, and medley events.

An alumnus of the Anglo-Chinese School, he subsequently graduated from the University of Texas at Austin, where he was a member of the Texas Longhorns swimming team, one of the top collegiate swim programmes under two-time United States Olympic men's head coach Eddie Reese.

In 2010, Schooling started training under Sergio Lopez Miro, who later on in 2015 would become Singapore's national head coach.

[15] Schooling won two individual titles (100 & 200-yard butterfly) at the 2015 NCAA Division I Men's Swimming and Diving Championships.

He teamed up with Kip Darmody, Will Licon, and Jack Conger to break the NCAA and US Open records.

Schooling started off his individual campaign with a bronze in the 50-yard freestyle in 18.79 behind Caeleb Dressel and Ryan Held.

Schooling ended his collegiate career at the University of Texas with 12 NCAA titles (4 individuals & 8 relays).

In the early part of his career, Schooling was trained by coaches and swimmers of Australia under the monitoring of Monash University in a Singapore Sports Council programme.

At the 2011 Southeast Asian Games, Schooling's 1:56.67 winning time in the 200 fly met the "A" qualifying mark for the 2012 London Olympics.

Schooling's time of 22.47 seconds in the 50 m freestyle broke a 33-year national record (22.69 s) that was held by Ang Peng Siong, who had set it at the 1982 U.S.

[25] Singapore's unique "rewards for sports excellence" is deemed to be the world's largest Olympic cash prize.

[26] As a University of Texas collegiate swimmer, Schooling was subject to the NCAA's strict rules against college athletes accepting prize money.

Schooling obtained a joint-Bronze medal with Briton James Guy with a time of 50.83 sec.

[42] Schooling did not defend his 100m butterfly title at the 2020 Tokyo Olympics after failing to qualify for the semi-finals, finishing 8th in his heat.

[46][47] President Halimah Yacob also made a public statement to show her support for the athletes.

[49] The Singapore Men's team for the 4x100m freestyle relay, comprising Mikkel Lee, Jonathan Tan, Schooling, and Quah Zheng Wen, was disqualified for an early take-off from one of the swimmers, after coming first in the race, thereby stripping Schooling of his first gold medal of the Games.

[51] Schooling remains unbeaten in the 100m butterfly since the 2013 SEA Games, winning his fifth consecutive gold medal in the event.

[52] Schooling was excluded from the final list of athletes set to represent Singapore at the 2022 Asian Games in Hangzhou, China (delayed due to the COVID-19 pandemic).

"[55] Singapore retained both gold medals won by Schooling in the 100m butterfly and the 4x100m medley at the 2021 SEA Games.

On 20 August 2023, responding to media queries on his omission from the 2022 Asian Games, Schooling remarked that it was "definitely was a bummer", adding that he was still undecided about his future.

[57] Minister for Defence Ng Eng Hen had said then that NS deferment "may be granted in exceptional circumstances to individual sportsmen, who are assessed to be potential medal winners at international competitions like the Olympic Games and bring national pride for the country.

This privilege was rescinded when it was reported on 30 August 2022 that Schooling had taken cannabis when he was overseas training for and participating in the 2021 Southeast Asian Games.