| Final | 19:36 | time | | gap | L | | 1. |  United States | 3:09.34 | | | 4 | 11. | | | Caeleb Dressel 47.67s, Ryan Held 46.99s, Justin Ress 47.48s, Brooks Curry 47.20s | | 2. |  Australia | 3:10.80 | | | 5 | 12. | | | William Yang 48.41s, Matthew Temple 48.17s, Jack Cartwright 47.62s, Kyle Chalmers 46.60s | | 3. |  Italy | 3:10.95 | | | 7 | 13. | | | Alessandro Miressi 48.38s, Thomas Ceccon 47.57s, Lorenzo Zazzeri 47.35s, Manuel Frigo 47.65s | | 4. |  Great Britain | 3:11.14 | NR | | 6 | 14. | | | Lewis Burras 48.09s, Jacob Whittle 47.91s, Matt Richards 48.19s, Tom Dean 46.95s | | 5. |  Hungary | 3:11.24 | | | 3 | 15. | | | Szebasztián Szabó 47.37s, Richárd Bohus 49.01s, Kristóf Milák 46.89s Nándor Németh 47.97s, | | 6. |  Canada | 3:11.99 | | | 2 | 16. | | | Joshua Liendo 47.87s, Ruslan Gaziev 48.02s, Javier Acevedo 47.97s, Yuri Kisil 48.13s | | 7. |  Brazil | 3:12.21 | | | 1 | 17. | | | Gabriel Santos 48.63s, Marcelo Chierighini 47.77s, Felipe Souza 48.18s, Vinicius Assunção 47.63s | | 8. |  Serbia | 3:13.83 | | | 8 | 8. | | | Velimir Stjepanović 48.99s, Andrej Barna 47.06s, Uroš Nikolić 48.65s, Nikola Aćin 49.13s |
| 74 Competitors from 18 Nations. | | World Record: United States 3:08.24 Beijing, China 11 August 2008 | | World Championship Record: United States 3:09.06 Gwangju, South Korea 21 July 2019 |
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Heats - Saturday, 18th June 11:29 | | Best 8 times advanced to Final. |
| Heat 2 | | time | | gap | L | Rk. | | 1. | United States | 3:10.80 | Q | | 4 | 1. | | | Hunter Armstrong 48.34s, Ryan Held 47.13s, Justin Ress 47.57s, Brooks Curry 47.76s | | 2. | Australia | 3:11.97 | Q | | 5 | 2. | | | William Yang 48.63s, Matthew Temple 48.40s, Jack Cartwright 47.83s, Kyle Chalmers 47.11s | | 3. | Hungary | 3:12.38 | Q | | 3 | 3. | | | Szebasztián Szabó 48.61s, Kristóf Milák 47.36s, Richárd Bohus 48.71s, Nándor Németh 47.70s | | 4. | Brazil | 3:13.76 | Q | | 6 | 7. | | | Gabriel Santos 49.04s, Marcelo Chierighini 48.07s, Felipe Souza 48.74s, Vinicius Assunção 47.91s | | 5. | Serbia | 3:14.26 | Q | | 2 | 8. | | | Velimir Stjepanović 48.98s, Uroš Nikolić 48.93s, Andrej Barna 47.25s, Nikola Aćin 49.10s | | 6. |  Israel | 3:15.35 | | | 7 | 9. | | | Tomer Frankel 49.08s, Gal Cohen Groumi 48.28s, Denis Loktev 48.86s, Meiron Cheruti 49.13s | | 7. |  China | 3:15.39 | | | 8 | 10. | | | Yang Jintong 49.39s, Hou Yujie 50.07s, Hong Jinquan 48.28s, Pan Zhanle 47.65s | | 8. |  Vietnam | 3:28.20 | | | 1 | 17. | | | Trần Hưng Nguyên 51.85s, Hồ Nguyễn Duy Khoa 53.47s, Hoàng Quý Phước 50.56s, Nguyễn Hữu Kim Sơn 52.32s | | -. |  Hong Kong | DSQ | | | 0 | -. | | | Nicholas Lim 52.08s, Ian HoLau Shiu YueCheuk Ming Ho |
| Heat 1 | | time | | gap | L | Rk. | | 1. | Great Britain | 3:12.55 | Q | | 3 | 4. | | | Lewis Burras 48.69s, James Guy 48.29s, Matt Richards 47.99s, Jacob Whittle 47.58s | | 2. | Canada | 3:13.08 | Q | | 5 | 5. | | | Ruslan Gaziev 48.78s, Yuri Kisil 48.75s, Javier Acevedo 48.27s, Joshua Liendo 47.28s | | 3. | Italy | 3:13.13 | Q | | 4 | 6. | | | Alessandro Miressi 48.32s, Thomas Ceccon 49.00s, Lorenzo Zazzeri 47.95s, Manuel Frigo 47.86s | | 4. |  Sweden | 3:15.46 | | | 2 | 11. | | | Björn Seeliger 49.06s, Isak Eliasson 48.46s, Robin Hanson 48.45s, Elias Persson 49.49s | | 5. |  South Korea | 3:15.68 | | | 8 | 12. | | | Hwang Sun-woo 48.07s, Lee Yoo-yeon 49.09s, Kim Ji-hun 49.23s, Kim Min-joon 49.29s | | 6. |  Greece | 3:17.83 | | | 6 | 13. | | | Odysseus Meladinis 49.34s, Stergios Bilas 48.87s, Evangelos Makrygiannis 49.88s, Dimitrios Markos 49.74s | | 7. |  Singapore | 3:18.76 | | | 0 | 14. | | | Quah Zheng Wen 49.25s, Jonathan Tan 49.08s, Mikkel Lee 49.99s, Darren Chua 50.44s | | 8. |  Egypt | 3:19.46 | | | 7 | 15. | | | Youssef Ramadan 48.90 NRs, Marwan Elkamash 50.08s, Abdelrahman Sameh 50.88s, Mohamed Samy 49.60s | | 9. |  Thailand | 3:26.85 | | | 1 | 16. | | | Dulyawat Kaewsriyong 50.67s, Tonnam Kanteemool 51.95s, Ratthawit Thammananthachote 53.19s, Navaphat Wongcharoen 51.04s |
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