Mixed 4 × 400 metres relay at the 2019 IAAF World Relays
Venue	Nissan Stadium
Dates	11 May (heats) & 12 May (finals A&B)
Nations	17
Winning time	3:16.43
Medalists
My'Lik Kerley Joanna Atkins Jasmine Blocker Dontavius Wright Brionna Thomas* Olivia Baker*    United States   Austin Cole Aiyanna Stiverne Zoe Sherar Philip Osei Alicia Brown*    Canada   Jared Momanyi Maureen Thomas Hellen Syombua Aron Koech    Kenya
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The mixed 4 × 400 metres relay at the 2019 IAAF World Relays was held at the Nissan Stadium on 11 and 12 May.

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.^[1][2]

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*,[3] *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[4]
	1	South Africa		DNS

^[5]

Rank	Nation	Athletes	Time	Notes	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