# 2019 IAAF World Relays – Mixed 4 × 400 metres relay

The mixed 4 × 400 metres relay at the 2019 IAAF World Relays was held at the Nissan Stadium on 11 and 12 May.

## Records

Prior to the competition, the records were as follows:
| World record | United States | 3:13.20 | Eugene, United States | 29 July 2016 |
| Championship record | Bahamas | 3:14.42 | Nassau, Bahamas | 23 April 2017 |

## Results

| KEY: | Q | Qualified | q | Fastest non-qualifiers | WL | World leading | CR | Championship record | NR | National record | SB | Seasonal best | WC | 2019 World Championships qualification |

### Heats

Qualification: First 2 of each heat (Q) plus the 2 fastest times (q) advanced to the final.
| Rank | Heat | Nation | Athletes | Time | Notes |
| 1 | 3 | Poland | Kajetan Duszyński (M), Patrycja Wyciszkiewicz (W), Justyna Święty-Ersetic (W), Karol Zalewski (M) | 3:15.46 | Q, WL, AR, *WC |
| 2 | 3 | United States | Brionna Thomas (W), My'Lik Kerley (M), Olivia Baker (W), Dontavius Wright (M) | 3:16.01 | Q, SB, *WC |
| 3 | 3 | Italy | Davide Re (M), Giancarla Trevisan (W), Andrew Howe (M), Raphaela Lukudo (W) | 3:16.12 | q, NR*, *WC |
| 4 | 2 | Canada | Austin Cole (M), Aiyanna Stiverne (W), Alicia Brown (W), Philip Osei (M) | 3:16.78 | Q, NR, *WC |
| 5 | 2 | Germany | Tobias Lange (M), Laura Müller (W), Nadine Gonska (W), Torben Junker (M) | 3:16.85 | Q, NR, *WC |
| 6 | 2 | Kenya | Jared Nyambweke Momanyi (M), Maureen Nyatichi Thomas (W), Hellen Syombua (W), Aron Koech (M) | 3:16.90 | q, NR, *WC |
| 7 | 1 | Belgium | Julien Watrin (M), Camille Laus (W), Liefde Schoemaker (W), Dylan Borlée (M) | 3:18.03 | Q, NR, *WC |
| 8 | 1 | Brazil | Lucas Carvalho (M), Tiffani Marinho (W), Cristiane Silva (W), Alexander Russo (M) | 3:18.26 | Q, AR, *WC |
| 9 | 1 | Jamaica | Fitzroy Dunkley (M), Janieve Russell (W), Rhonda Whyte (W), Jamari Rose (M) | 3:18.47 | NR, *WC |
| 10 | 3 | France | Wilfried Happio (M), Kellya Pauline (W), Estelle Perrossier (W), Nicolas Courbiere (M) | 3:18.93 | NR, *WC |
| 11 | 3 | Japan | Rikuya Ito (M), Seika Aoyama (W), Mayu Inaoka (W), Naoki Kitadani (M) | 3:19.71 | NR, *WC |
| 12 | 2 | Great Britain | Alex Haydock-Wilson (M), Finette Agyapong (W), Anyika Onuora (W), Jamal Rhoden-Stevens (M) | 3:20.49 | NR, *WC |
| 13 | 2 | China | Lu Zhiquan (M), Wang Chunyu (W), Huang Guifen (W), Yu Yang (M) | 3:21.66 | |
| 14 | 1 | Australia | Ian Halpin (M), Rebecca Bennett (W), Angeline Blackburn (W), Luke Stevens (M) | 3:21.80 | SB |
| 15 | 1 | India | Jithu Baby (M), Sonia Baishya (W), Prachi (W), Antony Alex (M) | 3:23.59 | |
| 16 | 2 | Kazakhstan | Andrey Sokolov (M), Svetlana Golendova (W), Elina Mikhina (W), Mikhail Litvin (M) | 3:24.54 | |
| | 3 | Papua New Guinea | Emmanuel Wanga (M), Leonie Beu (W), Shadrick Tansi (M), Isila Manukip Apkup (W) | DQ | R170.19 |
| | 1 | South Africa | | DNS | |

### Final

| Rank | Nation | Athletes | Time | Points |
| | United States | My'Lik Kerley (M), Joanna Atkins (W), Jasmine Blocker (W), Dontavius Wright (M) | 3:16.43 | 8 |
| | Canada | Austin Cole (M), Aiyanna Stiverne (W), Zoe Sherar (W), Philip Osei (M) | 3:18.15 | 7 |
| | Kenya | Jared Momanyi (M), Maureen Thomas (W), Hellen Syombua (W), Aron Koech (M) | 3:19.43 | 6 |
| 4 | Italy | Giuseppe Leonardi (M), Virginia Troiani (W), Chiara Bazzoni (W), Alessandro Sibilio (M) | 3:20.28 | 5 |
| 5 | Poland | Przemysław Waściński (M), Małgorzata Hołub-Kowalik (W), Justyna Saganiak (W), Patryk Dobek (M) | 3:20.65 | 4 |
| 6 | Brazil | Lucas Carvalho (M), Tiffani Marinho (W), Cristiane Silva (W), Alexander Russo (M) | 3:20.71 | 3 |
| 7 | Germany | Marc Koch (M), Corinna Schwab (W), Svea Köhrbrück (W), Marvin Schlegel (M) | 3:22.26 | 2 |
| 8 | Belgium | Julien Watrin (M), Lucie Ferauge (W), Hanne Claes (W), Jonathan Sacoor (M) | 3:25.74 | 1 |