See main article: Athletics at the 2023 SEA Games. The mixed relay competition at the 2023 SEA Games in Cambodia took place on 8 May 2023, at the Morodok Techo National Stadium in Phnom Penh.[1]
Four teams of four athletes each took part of the competition.
| Event: | Athletics – Mixed 4 x 400 metre relay |
| Year: | 2023 |
| Venue: | Morodok Techo National Stadium |
| Date: | 8 May 2023 |
| Competitors: | 16 |
| Nations: | 4 |
| Gold: | Quách Công Lịch Trần Đình Sơn Trần Nhật Hoàng Hoàng Thị Ánh Thục Nguyễn Thị Hằng Nguyễn Thị Huyền |
| Gold Nation: | VIE |
| Silver: | Chitdara Phretewek Joseph Onuora Patcharaporn Jongkaijak Phattaraporn Dechanon Sarawut Nuansi Thipphanet Meechan |
| Silver Nation: | THA |
| Bronze: | Frederick Ramirez Joyme Sequita Michael Del Prado Umajesty Williams |
| Bronze Nation: | PHI |
Prior to this competition, the existing Asian and SEA Games records were as follows:
| AR | Musa Isah, Aminat Yusuf Jamal, Salwa Eid Naser, Abbas Abubakar Abbas | 3:11.82 | Doha, Qatar | 29 September 2019 | |
| GR | Siripol Punpa, Supanich Poolkerd, Joshua Atkinson, Benny Nontanam | 3:19.29 | Hanoi, Vietnam | 14 May 2022 |
| Rank | Athlete | Time | Notes | |
|---|---|---|---|---|
| 3:21.27 | ||||
Chitdara Phretewek, Joseph Onuora, Patcharaporn Jongkaijak, Phattaraporn Dechanon, Sarawut Nuansi, Thipphanet Meechan | 3:23.02 | |||
Frederick Ramirez, Joyme Sequita, Michael Del Prado, Umajesty Williams | 3:23.69 | |||
| 4 | Umar Osman, Abdul Wafiy Roslan, Muhammad Firdaus Musa, Chelsea Cassiopea Evali Bopulas, Mandy Goh Li, Zaimah Atifah Zainuddin | 3:31.25 |