| Event: | Mixed 4 × 400 metres relay |
| Competition: | 2021 World Athletics Relays |
| Win Value: | 3:16.60 |
| Goldnoc: | ITA |
| Gold: | Edoardo Scotti (M) Giancarla Trevisan (W) Alice Mangione (W) Davide Re (M) |
| Silvernoc: | BRA |
| Silver: | Tiffani Marinho (W) Geisa Coutinho (W) Alison dos Santos (M) |
| Bronzenoc: | DOM |
| Bronze: | Lidio Féliz (M) Anabel Medina Ventura (W) Marileidy Paulino (W) Alexander Ogando (M) |
| Nations: | 21 |
| Dates: | 1 May (heats) & 2 May (final) |
| Venue: | Silesian Stadium |
| Prev: | 2019 |
| Next: | 2024 |
The mixed 4 × 400 metres relay at the 2021 World Athletics Relays was held at the Silesian Stadium on 1 and 2 May.[1]
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 |
Qualification: First 2 of each heat (Q) plus the 2 fastest times (q) advanced to the final.[2]
| Rank | Heat | Nation | Athletes | Time | Notes | |
|---|---|---|---|---|---|---|
| 1 | 2 | Edoardo Scotti (M), Giancarla Trevisan (W), Alice Mangione (W), Davide Re (M) | 3:16.52 | Q, OG*, WC* | ||
| 2 | 3 | Anderson Henriques (M), Tiffani Marinho (W), Geisa Coutinho (W), Alison dos Santos (M) | 3:16.53 | Q, WC* | ||
| 3 | 3 | Yancarlos Martínez (M), Anabel Medina (W), Marileidy Paulino (W), Alexander Ogando (M) | 3:16.67 | Q, OG*, WC* | ||
| 4 | 3 | Christopher O'Donnell (M), Phil Healy (W), Sharlene Mawdsley (W), Thomas Barr (M) | 3:16.84 | q, OG*, WC* | ||
| 5 | 2 | Jonathan Sacoor (M), Cynthia Bolingo (W), Camille Laus (W), Kevin Borlée (M) | 3:17.23 | Q, WC* | ||
| 6 | 3 | Rabah Yousif (M), Laviai Nielsen (W), Emily Diamond (W), Lee Thompson (M) | 3:17.27 | q, WC* | ||
| 7 | 2 | Jhon Perlaza (M), Rosa Escobar (W), Jennifer Padilla (W), Anthony Zambrano (M) | 3:17.61 | , WC* | ||
| 8 | 2 | Mateusz Rzeźniczak (M), Aleksandra Gaworska (W), Karolina Łozowska (W), Patryk Grzegorzewicz (M) | 3:17.92 | , WC* | ||
| 9 | 1 | Nout Wardenburg (M), Femke Bol (W), Lieke Klaver (W), Tony van Diepen (M) | 3:18.04 | Q, OG*, WC* | ||
| 10 | 2 | Kosuke Ikeda (M), Nanako Matsumoto (W), Mayu Kobayashi (W), Aoto Suzuki (M) | 3:18.76 | , WC* | ||
| 11 | 1 | Julio Arenas (M), Andrea Jiménez (W), Aauri Lorena Bokesa (W), Bernat Erta (M) | 3:18.98 | Q NR, OG*, WC* | ||
| 12 | 2 | Ukona Khuzwayo (M), Dalene Mpiti (W), Taylon Bieldt (W), Ranti Dikgale (M) | 3:19.18 | , WC* | ||
| 13 | 3 | Henrik Krause (M), Luna Thiel (W), Hannah Mergenthaler (W), Johannes Trefz (M) | 3:19.19 | |||
| 14 | 2 | Oliver Murcko (M), Iveta Putalová (W), Emma Zapletalová (W), Šimon Bujna (M) | 3:19.66 | |||
| 15 | 3 | Aliaksandr Vasileuskiy (M), Aliaksandra Khilmanovich (W), Asteria Limai (W), (M) | 3:19.73 | |||
| 16 | 1 | Amandine Brossier (W), Elise Trynkler (W), Christopher Naliali (M), Thomas Jordier (M) | 3:20.95 | |||
| 17 | 3 | Zibane Ngozi (M), Oarabile Mokenane (W), Christine Botlogetswe (W), Bayapo Ndori (M) | 3:20.97 | |||
| 18 | 1 | Kubilay Ençü (M), Büşra Yıldırım (W), Elif Polat (W), Sinan Ören (M) | 3:20.98 | |||
| 19 | 1 | Matěj Krsek (M), Barbora Malíková (W), Lada Vondrová (W), Daniel Lehar (M) | 3:21.05 | |||
| 20 | 1 | Vera Barbosa (W), Ricardo dos Santos (M), Cátia Azevedo (W), Mauro Pereira (M) | 3:21.51 | |||
| 1 | Jared Momanyi (M), (W), Mary Moraa (W), Aron Koech (M) |
Italian national track relay team confirms the first place obtained in the heats summary.[3]
| Rank | Nation | Athletes | Time | Notes | |
|---|---|---|---|---|---|
| Edoardo Scotti (M), Giancarla Trevisan (W), Alice Mangione (W), Davide Re (M) | 3:16.60 | ||||
| Anderson Henriques (M), Tiffani Marinho (W), Geisa Coutinho (W), Alison dos Santos (M) | 3:17.54 | ||||
| Lidio Féliz (M), Anabel Medina Ventura (W), Marileidy Paulino (W), Alexander Ogando (M) | 3:17.58 | ||||
| 4 | Dylan Borlée (M), Cynthia Bolingo (W), Camille Laus (W), Kevin Borlée (M) | 3:17.92 | |||
| 5 | Lee Thompson (M), Zoey Clark (W), Yasmin Liverpool (W), Rabah Yousif (M) | 3:18.87 | |||
| 6 | Samuel García (M), Andrea Jiménez (W), Aauri Bokesa (W), Bernat Erta (M) | 3:19.65 | |||
| 7 | Andrew Mellon (M), Phil Healy (W), Sharlene Mawdsley (W), Christopher O'Donnell (M) | 3:20.26 | |||
| 8 | Nout Wardenburg (M), Eveline Saalberg (W), Laura de Witte (W), Terrence Agard (M) | 3:21.02 |