| Election Name: | 2021 Brentwood Borough Council Election |
| Seats After2: | 12 |
| Party3: | Labour Party (UK) |
| Seat Change1: | 3 |
| Seats After1: | 23 |
| Popular Vote1: | 9,443 |
| Percentage1: | 49.1% |
| Party2: | Liberal Democrats (UK) |
| Seats Before2: | 13 |
| Seats2: | 1 |
| Seat Change2: | 1 |
| Popular Vote2: | 6,092 |
| Party1: | Conservative Party (UK) |
| Percentage2: | 31.7% |
| After Election: | Conservatives |
| Flag Image: | File:CoatOfArmsBrentwood.jpg |
| Party4: | Independent politician |
| Seats Before4: | 1 |
| Seats4: | 0 |
| Seats After4: | 0 |
| Seat Change4: | 1 |
| Popular Vote4: | 638 |
| Seats1: | 3 |
| Election Date: | 6 May 2021 |
| Seats After3: | 2 |
| Seat Change3: | 1 |
| Popular Vote3: | 2,185 |
| Percentage3: | 11.4% |
| Seats3: | 0 |
| Map Size: | 300px |
| Council control | |
| Posttitle: | Council control after election |
| Before Election: | Conservatives |
| Seats Before3: | 3 |
| Majority Seats: | 19 |
| Seats Before1: | 20 |
| Type: | Parliamentary |
| Ongoing: | no |
| Party Colour: | yes |
| Previous Election: | 2019 Brentwood Borough Council election |
| Previous Year: | 2019 |
| Next Election: | 2022 Brentwood Borough Council election |
| Next Year: | 2022 |
| Seats For Election: | 12 of the 37 seats to Brentwood Borough Council |
| Percentage4: | 3.3% |
The 2021 Brentwood Borough Council election took place on 6 May 2021 to elect members of Brentwood Borough Council in England.[1] This was on the same day as other local elections.