# Swimming at the 2001 World Aquatics Championships – Men's 4 × 100 metre medley relay

The men's 4 × 100 metre medley relay event at the 2001 World Aquatics Championships took place in Marine Messe in Fukuoka, Japan in 28 July 2001.

## Records

Prior to the competition, the existing world and championship records were as follows.
| | Nation | Time | Location | Date |
| World record | United States Lenny Krayzelburg (53.87) Ed Moses (59.84) Ian Crocker (52.10) Gary Hall Jr. (47.92) | 3:33.73 | Sydney, Australia | 23 Sep 2000 |
| Championship record | United States Jeff Rouse (54.49) Eric Wunderlich (1:01.34) Mark Henderson (53.33) Gary Hall Jr. (48.55) | 3:37.74 | Rome, Italy | 11 Sep 1994 |
The following record was established during the competition:
| Date | Round | Nation | Time | Record |
| 28 July | Heat 3 | United States Aaron Peirsol (55.36) Brendan Hansen (1:00.32) Daniel Jones (52.93) Scott Tucker (48.95) | 3:37.56 | CR |
| 28 July | Final | Australia Matt Welsh (55.19) Regan Harrison (1:00.80) Geoff Huegill (51.39) Ian Thorpe (47.97) | 3:35.35 | CR |

## Results
### Heats

| Place | Heat | Lane | Nation | Swimmers (split) | Time | Notes |
| 1 | 3 | 4 | United States | Aaron Peirsol (55.36) Brendan Hansen (1:00.32) Daniel Jones (52.93) Scott Tucker (48.95) | 3:37.56 | Q, CR |
| 2 | 2 | 4 | Australia | Josh Watson (55.96) Phil Rogers (1:01.50) Adam Pine (52.84) Ashley Callus (48.53) | 3:38.83 | Q |
| 3 | 1 | 3 | Canada | Tobias Oriwol (56.58) Morgan Knabe (1:00.34) Mike Mintenko (52.36) Rick Say (49.98) | 3:39.26 | Q |
| 4 | 1 | 5 | Hungary | Péter Horváth (55.81) Károly Güttler (1:01.80) Zsolt Gáspár (53.25) Attila Zubor (48.64) | 3:39.50 | Q |
| 5 | 1 | 4 | Germany | Steffen Driesen (56.00) Jens Kruppa (1:02.88) Thomas Rupprath (52.35) Torsten Spanneberg (48.55) | 3:39.78 | Q |
| 6 | 3 | 5 | Netherlands | Klaas-Erik Zwering (56.40) Benno Kuipers (1:02.73) Joris Keizer (52.92) Johan Kenkhuis (47.89) | 3:39.94 | Q |
| 7 | 3 | 3 | Russia | Vladislav Aminov (55.75) Dmitry Komornikov (1:00.75) Igor Marchenko (52.89) Leonid Khokhlov (50.96) | 3:40.35 | Q |
| 8 | 2 | 5 | Japan | Atsushi Nishikori (56.47) Kosuke Kitajima (1:00.89) Takashi Yamamoto (52.94) Yoshihiro Okumura (50.54) | 3:40.84 | Q |
| 9 | 2 | 3 | Sweden | Daniel Lönnberg (57.56) Martin Gustafsson (1:02.33) Lars Frölander (52.21) Stefan Nystrand (49.21) | 3:41.31 | |
| 10 | 2 | 6 | Croatia | Gordan Kožulj (55.74) Vanja Rogulj (1:02.15) Ivan Mladina (54.49) Duje Draganja (49.60) | 3:41.98 | |
| 11 | 3 | 6 | Brazil | Alexandre Massura (56.75) Eduardo Fischer (1:02.25) Fernando Alves (53.86) Gustavo Borges (49.88) | 3:42.74 | |
| 12 | 3 | 2 | Italy | Eduardo Merisi (56.99) Domenico Fioravanti (1:01.82) Christian Galenda (53.91) Simone Cercato (50.60) | 3:43.32 | |
| 13 | 1 | 6 | Switzerland | Philipp Gilgen (58.45) Remo Lütolf (1:04.24) Lorenz Liechti (57.15) Karel Novy (50.72) | 3:50.56 | |
| 14 | 2 | 2 | China | Zheng Shibin (58.86) Zeng Qiliang (1:05.97) Ouyang Kunpeng (53.71) Xie Xufeng (52.89) | 3:51.43 | |
| 15 | 3 | 7 | Mexico | Juan Carlos Rodela (58.50) Javier Díaz (1:06.92) Cesar Uribe (56.11) Alejandro Siqueiros (52.71) | 3:54.24 | |
| 16 | 2 | 7 | Chinese Taipei | Wu Nien-Pin (1:00.84) Yang Shang-Hsuan (1:05.47) Chen Jui-Then (58.97) Jiang Bing-Ru (54.66) | 3:59.94 | |
| 17 | 1 | 7 | Macau | Chi Lon Lei (1:03.04) Chan Wai Ma (1:08.37) Wing Cheung Victor Wong (59.05) Chon Kit Alias Joao Tang (55.39) | 4:05.85 | |

### Final

| Place | Lane | Nation | Swimmers (split) | Time | Notes |
| | 5 | Australia | Matt Welsh (55.19) Regan Harrison (1:00.80) Geoff Huegill (51.39) Ian Thorpe (47.97) | 3:35.35 | CR |
| | 2 | Germany | Steffen Driesen (55.22) Jens Kruppa (1:01.06) Thomas Rupprath (51.96) Torsten Spanneberg (48.10) | 3:36.34 | |
| | 1 | Russia | Vladislav Aminov (55.63) Dmitry Komornikov (1:00.90) Vladislav Kulikov (52.01) Dmitry Chernyshov (49.23) | 3:37.77 | |
| 4 | 3 | Canada | Tobias Oriwol (56.46) Morgan Knabe (1:00.51) Mike Mintenko (51.63) Rick Say (49.63) | 3:38.23 | |
| 5 | 6 | Hungary | Péter Horváth (55.48) Károly Güttler (1:01.29) Zsolt Gáspár (53.05) Attila Zubor (48.47) | 3:38.29 | |
| 6 | 8 | Japan | Atsushi Nishikori (54.33) Kosuke Kitajima (1:00.18) Takashi Yamamoto (52.19) Daisuke Hosokawa (50.22) | 3:38.92 | |
| – | 7 | Netherlands | Klaas-Erik Zwering Benno Kuipers Joris Keizer Pieter van den Hoogenband | DSQ | |
| – | 4 | United States | Randall Bal Ed Moses Ian Crocker Anthony Ervin | DSQ | |