| Event: | Mixed 4 x 400 metres relay |
| Competition: | 2017 IAAF World Relays |
| Venue: | Thomas Robinson Stadium |
| Dates: | 23 April (final) |
| Competitors: | 32 |
| Nations: | 8 |
| Gold: | Steven Gardiner Shaunae Miller Anthonique Strachan Michael Mathieu |
| Goldnoc: | BAH |
| Silver: | Michael Berry Jaide Stepter Paul Dedewo Claudia Francis |
| Silvernoc: | USA |
| Bronze: | Javere Bell Ristananna Tracey Natoya Goule Jamari Rose |
| Bronzenoc: | JAM |
| Next: | 2019 |
The Mixed 4 x 400 metres relay at the 2017 IAAF World Relays was held at the Thomas Robinson Stadium on 22 April. It was the first time that this event was held at the IAAF World Relays or indeed any senior level major international competition. Each team had to comprise two men and two women but could line them up in any order.
| Rank | Lane | Nation | Athletes | Time | Points | |
|---|---|---|---|---|---|---|
| 4 | Steven Gardiner (M), Shaunae Miller (W), Anthonique Strachan (W), Michael Mathieu (M) | 3:14.42 | 8 | |||
| 5 | Michael Berry (M), Jaide Stepter (W), Paul Dedewo (M), Claudia Francis (W) | 3:17.29 | 7 | |||
| 6 | Javere Bell (M), Ristananna Tracey (W), Natoya Goule (W), Jamari Rose (M) | 3:20.26 | 6 | |||
| 4 | 3 | Kacper Kozłowski (M), Martyna Dąbrowska (W), Małgorzata Curyło (W), Rafał Omelko (M) | 3:22.26 | 5 | ||
| 5 | 2 | Mason Cohen (M), Alicia Keir (W), Ella Nelson (W), Josh Ralph (M) | 3:23.14 | 4 | ||
| 6 | 7 | Alphas Kishoyian (M), Jacinter Shikanda (W), Boniface Mweresa (W), Veronica Mutua (M) | 3:23.79 | 3 | ||
| 7 | 1 | Jarrin Solomon (M), Domonique Williams (W), Emmanuel Callender (M), Chelsea Charles (W) | 3:25.49 | 2 | ||
| 8 | Leaname Maotoanong (M), Goitseone Seleka (W), Boitumelo Masilo (M), Loungo Matlhaku (W) | 0[2] |