| Election Name: | 1990 Southwark London Borough Council election |
| Type: | parliamentary |
| Ongoing: | no |
| Party Colour: | Labour Party (UK) |
| Previous Election: | 1986 Southwark London Borough Council election |
| Previous Year: | 1986 |
| Next Election: | 1994 Southwark London Borough Council election |
| Next Year: | 1994 |
| Seats For Election: | All 64 seats up for election to Southwark London Borough Council |
| Party1: | Labour Party (UK) |
| Seats1: | 37 |
| Seat Change1: | 3 |
| Popular Vote1: | 81,241 |
| Percentage1: | 49.89% |
| Party2: | Liberal Democrats (UK) |
| Seats2: | 21 |
| Seat Change2: | 5 |
| Popular Vote2: | 42,802 |
| Percentage2: | 26.29% |
| Council control | |
| Before Party: | Labour Party (UK) |
| Posttitle: | Council control after election |
| After Party: | Labour Party (UK) |
| Party3: | Conservative Party (UK) |
| Seats3: | 6 |
| Seat Change3: | 1 |
| Popular Vote3: | 33,231 |
| Percentage3: | 20.41% |
| Majority Seats: | 33 |
| Country: | London |
| Registered: | 171,625[1] |
| Turnout: | 69,572, 40.54% |
| Seats Before2: | 15 |
| Seats Before1: | 43 |
| Seats Before3: | 6 |
| Seat Change4: | 1 |
| Party4: | Independent Labour Lion Party |
| Seats4: | 0 |
| Seats Before4: | 1 |
| Popular Vote4: | 2,028 |
| Percentage4: | 1.24% |
Elections to Southwark Council were held in May 1990. The whole council was up for election. Turnout was 40.54%.
(*) - indicates an incumbent candidate
(†) - indicates an incumbent candidate standing in a different seat than which they were elected to