| Election Name: | 2021 Eastleigh Borough Council election |
| Type: | parliamentary |
| Ongoing: | no |
| Party Colour: | Liberal Democrats (UK) |
| Previous Election: | 2019 Eastleigh Borough Council Elections |
| Previous Year: | 2019 |
| Next Election: | 2022 |
| Next Year: | 2022 |
| Seats For Election: | 12 of 39 seats to Eastleigh Borough Council |
| Majority Seats: | 20 |
| Election Date: | 6 May 2021 |
| Leader1: | Keith House |
| Party1: | Liberal Democrats (UK) |
| Leaders Seat1: | Hedge End South |
| Last Election1: | 34 |
| Seats Before1: | 32 |
| Seats1: | 10 |
| Leader2: | Louise Parker-Jones |
| Party2: | Independent politician |
| Leaders Seat2: | Bishopstoke |
| Last Election2: | 3 |
| Seats Before2: | 3 |
| Seats2: | 1 |
| Leader3: | Margaret Atkinson |
| Party3: | Conservative Party (UK) |
| Leaders Seat3: | Hiltingbury (defeated) |
| Last Election3: | 2 |
| Seats Before3: | 2 |
| Seats3: | 1 |
| Council control | |
| Posttitle: | Council control after election |
| Before Party: | Liberal Democrats |
| After Party: | Liberal Democrats |
| Seats After1: | 32 |
| Seats After2: | 3 |
| Seats After3: | 3 |
The 2021 Eastleigh Borough Council election took place on 6 May 2021 to elect 12 councillors to Eastleigh Borough Council. Every ward apart from the two member wards of West End North and West End South elected one councillor each.[1] This took place at the same time as the elections for Hampshire County Council and the Hampshire Police and Crime Commissioner.[2]
The Liberal Democrats and Conservatives each gained one seat from each other, meaning that the council composition remained the same.
There was no election in Botley in 2019, so changes are shown from 2018.