| Election Name: | 2021 Vietnamese parliamentary election |
| Country: | Vietnam |
| Type: | parliamentary |
| Ongoing: | no |
| Previous Election: | 2016 Vietnamese legislative election |
| Previous Year: | 2016 |
| Next Election: | 2026 Vietnamese legislative election |
| Next Year: | 2026 |
| Seats For Election: | All 500 seats in the National Assembly |
| Majority Seats: | 251 |
| Election Date: | 23 May 2021 |
| Turnout: | 99.60% |
| Leader1: | Nguyễn Phú Trọng |
| Party1: | Communist Party of Vietnam |
| Leader Since1: | 19 January 2011 |
| Last Election1: | 475 seats |
| Seats1: | 485 |
| Seat Change1: | 10 |
| Colour2: | DDDDDD |
| Leader2: | – |
| Leader Since2: | – |
| Party2: | Non-party members |
| Last Election2: | 19 seats |
| Seats2: | 14 |
| Seat Change2: | 5 |
| Prime Minister | |
| Before Election: | Phạm Minh Chính |
| After Election: | Phạm Minh Chính |
Legislative elections were held in Vietnam on 23 May 2021 to elect members of the National Assembly, which would subsequently appoint the Prime Minister, and deputies of People's Councils.[1] The election took place on a Sunday in line with local legislation. Results were announced on 10 June.
The Communist Party of Vietnam rules Vietnam as a one-party state and as such is the only party that can contest the elections. In the 2016 elections the party won 475 of the 496 seats, with the rest going to independent members of the government-aligned Vietnamese Fatherland Front.
The members of the National Assembly were elected from 184 multi-member constituencies using the two-round system, with a maximum number of 500 candidates to be elected. Block voting was used, with each district having two or three seats.[2] Candidates had to receive at least 50% of the vote in the first round to be elected, with a second round held on a plurality basis.[3]
One seat in Bình Dương Province was left vacant after the National Election Council did not confirm the winning candidate was eligible to enter parliament.[4]