| Event: | Mixed doubles |
| Championship: | BWF World Championships |
| Dates: | 30 July – 5 August |
| Venue: | Nanjing Youth Olympic Sports Park Indoor Arena |
| Location: | Nanjing, China |
| Gold: | Zheng Siwei Huang Yaqiong |
| Gold Nation: | CHN |
| Silver: | Wang Yilü Huang Dongping |
| Silver Nation: | CHN |
| Bronze: | Zhang Nan Li Yinhui |
| Bronze Nation: | CHN |
| Bronze2: | Tang Chun Man Tse Ying Suet |
| Bronze2 Nation: | HKG |
| Prev: | 2017 Glasgow |
| Next: | 2019 Basel |
The mixed doubles tournament of the 2018 BWF World Championships (World Badminton Championships) took place from 30 July to 5 August.
The seeding list is based on the World Rankings from 12 July 2018.[1]
See also: 1 and 1. 
Zheng Siwei / Huang Yaqiong (world champions)
See also: 2 and 4. Wang Yilü / Huang Dongping (final)
See also: 3 and 3. 
Tang Chun Man / Tse Ying Suet (semifinals)
See also: 4 and 2. Mathias Christiansen / Christinna Pedersen (quarterfinals)
See also: 5 and 2. Zhang Nan / Li Yinhui (semifinals)
See also: 6 and 4. Chris Adcock / Gabby Adcock (quarterfinals)
See also: 7 and 1. Goh Soon Huat / Shevon Jemie Lai (third round)
See also: 8 and 3. Chan Peng Soon / Goh Liu Ying (quarterfinals)
See also: 9 and 4. He Jiting / Du Yue (third round)
See also: 10 and 2. 
Dechapol Puavaranukroh / Sapsiree Taerattanachai (third round)
See also: 11 and 3. Marcus Ellis / Lauren Smith (third round)
See also: 12 and 1. Hafiz Faizal / Gloria Emanuelle Widjaja (third round)
See also: 13 and 3. Praveen Jordan / Melati Daeva Oktavianti (third round)
See also: 14 and 2. Wang Chi-lin / Lee Chia-hsin (third round)
See also: 15 and 1. Mark Lamsfuß / Isabel Herttrich (second round)
See also: 16 and 4. 
Yuta Watanabe / Arisa Higashino (third round)