| Final | 19:20 | time | | gap | L | | 1. |  Italy | 3:27.51 | =ER | | 3 | 1. | | | Thomas Ceccon 51.93s, Nicolò Martinenghi 57.47s, Federico Burdisso 50.63s, Alessandro Miressi 47.48s | | 2. |  United States | 3:27.79 | | | 4 | 2. | | | Ryan Murphy 52.51s, Nic Fink 57.86s, Michael Andrew 50.06s, Ryan Held 47.36s | | 3. |  Great Britain | 3:31.31 | | | 2 | 3. | | | Luke Greenbank 53.81s, James Wilby 58.82s, James Guy 51.23s, Tom Dean 47.45s | | 4. |  Australia | 3:31.81 | | | 6 | 4. | | | Isaac Cooper 54.29s, Zac Stubblety-Cook 59.88s, Matthew Temple 50.75s, Kyle Chalmers 46.89s | | 5. |  France | 3:32.37 | | | 5 | 5. | | | Yohann Ndoye Brouard 53.08s, Antoine Viquerat 1:00.34, Léon Marchand 51.50s, Maxime Grousset 47.45s | | 6. |  Germany | 3:32.63 | | | 1 | 6. | | | Ole Braunschweig 53.94s, Lucas Matzerath 59.32s, Jan Eric Friese 51.03s, Rafael Miroslaw 48.34s | | 7. |  Austria | 3:32.80 | Nr | | 8 | 7. | | | Bernhard Reitshammer 54.38s, Valentin Bayer 59.73s, Simon Bucher 51.04s, Heiko Gigler 47.65s | | 8. |  China | 3:34.62 | | | 7 | 8. | | | Wang Shun 55.19s, Qin Haiyang 59.44s, Wang Changhao 51.38s, Pan Zhanle 48.61s |
| 90 Competitors from 20 Nations. | | World Record: United States 3:26.78 Tokyo, Japan 1 August 2021 | | World Championship Record: United States 3:27.28 Rome, Italy 2 August 2009 |
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Heats - Saturday, 25th June 09:21 | | Best 8 times advanced to Final. |
| Heat 3 | | time | | gap | L | Rk. | | 1. | United States | 3:32.91 | Q | | 4 | 1. | | | Hunter Armstrong 53.70s, Nic Fink 59.57s, Trenton Julian 51.35s, Brooks Curry 48.29s | | 2. | Italy | 3:33.02 | Q | | 5 | 3. | | | Thomas Ceccon 53.87s, Nicolò Martinenghi 59.50s, Piero Codia 51.71s, Lorenzo Zazzeri 47.94s | | 3. | Germany | 3:33.98 | Q | | 2 | 7. | | | Ole Braunschweig 53.95s, Lucas Matzerath 1:00.00, Jan Eric Friese 51.73s, Rafael Miroslaw 48.30s | | 4. |  Japan | 3:34.17 | | | 3 | 9. | | | Ryosuke Irie 53.31s, Ryuya Mura 1:00.08, Naoki Mizunuma 52.66s, Katsuhiro Matsumoto 48.12s | | 5. |  Canada | 3:35.62 | | | 6 | 11. | | | Javier Acevedo 53.52s, James Dergousoff 1:01.06, Joshua Liendo 51.26s, Ruslan Gaziev 48.78s | | 6. |  Paraguay | 3:48.32 | | | 9 | 17. | | | Charles Hockin 56.68s, Renato Prono 1:04.35, Ben Hockin 54.75s, Matheo Mateos 52.54s | | 7. |  Thailand | 3:50.05 | | | 0 | 18. | | | Tonnam Kanteemool 53.41s, Dulyawat Kaewsriyong 1:05.15, Navaphat Wongcharoen 53.80s, Ratthawit Thammananthachote 53.69s | | -. |  Lithuania | DSQ | | | 7 | -. | | | Erikas Grigaitis 55.61s, Andrius ŠidlauskasDeividas MargevičiusDanas Rapšys | | -. |  Singapore | | | | 1 | -. | | | &dns | | -. |  Egypt | | | | 8 | -. | | | &dns |
| Heat 2 | | time | | gap | L | Rk. | | 1. | France | 3:32.98 | Q | | 6 | 2. | | | Yohann Ndoye Brouard 53.12s, Antoine Viquerat 1:00.42, Léon Marchand 52.09s, Maxime Grousset 47.35s | | 2. | Australia | 3:33.20 | Q | | 5 | 4. | | | Mitchell Larkin 53.02s, Zac Stubblety-Cook 1:00.18, Matthew Temple 51.20s, Jack Cartwright 47.80s | | 3. | Great Britain | 3:33.56 | Q | | 4 | 5. | | | Luke Greenbank 53.28s, James Wilby 59.47s, Jacob Peters 51.91s, Lewis Burras 47.90s | | 4. | China | 3:33.61 | Q | | 3 | 6. | | | Xu Jiayu 53.72s, Qin Haiyang 59.37s, Wang Changhao 51.94s, Pan Zhanle 48.58s | | 5. | Austria | 3:34.06 | Q, NR | | 7 | 8. | | | Bernhard Reitshammer 53.99s, Valentin Bayer 59.79s, Simon Bucher 51.36s, Heiko Gigler 47.92s | | 6. |  Brazil | 3:34.66 | | | 8 | 10. | | | Guilherme Basseto 54.81s, João Gomes Júnior 59.50s, Matheus Gonche 52.18s, Luiz Gustavo Borges 48.17s | | 7. |  Greece | 3:36.36 | | | 2 | 14. | | | Evangelos Makrygiannis 53.43s, Konstantinos Meretsolias 1:00.17, Konstantinos Stamou 52.48s, Dimitrios Markos 49.28s | | 8. |  Chinese Taipei | 3:42.21 | | | 9 | 15. | | | Chuang Mu-lun 55.65s, Cai Bing-rong 1:03.17, Wang Kuan-hung 53.39s, Wang Hsing-hao 50.00s | | 9. |  Vietnam | 3:47.69 | | | 1 | 16. | | | Trần Hưng Nguyên 58.53s, Phạm Thanh Bảo 1:03.66, Hồ Nguyễn Duy Khoa 55.37s, Hoàng Quý Phước 50.13s | | -. |  Israel | DNS | | | 0 | -. | | | |
| Heat 1 | | time | | gap | L | Rk. | | 1. |  Spain | 3:36.10 | | | 4 | 12. | | | Hugo González 53.67s, Carles Coll 1:01.10, Alberto Lozano 52.44s, Sergio de Celis 48.89s | | 2. |  South Korea | 3:36.28 | | | 3 | 13. | | | Lee Ju-ho 53.04s, Moon Seung-woo 1:00.33, Cho Sung-jae 52.72s, Hwang Sun-woo 49.19s | | -. |  Hong Kong | DSQ | | | 5 | -. | | | Lau Shiu Yue 56.88s, Adam Chillingworth, Nicholas LimIan Ho |
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