| Election Date: | 4 May 1978 |
| Election Name: | 1978 Southwark Council election |
| Type: | parliamentary |
| Ongoing: | no |
| Party Colour: | Labour Party (UK) |
| Previous Election: | 1974 Southwark London Borough Council election |
| Previous Year: | 1974 |
| Next Election: | 1982 Southwark London Borough Council election |
| Next Year: | 1982 |
| Seats For Election: | All council seats |
| Party1: | Labour Party (UK) |
| Seats1: | 56 |
| Seat Change1: | 10 |
| Popular Vote1: | 29,551 |
| Percentage1: | 57.88% |
| Party2: | Conservative Party (UK) |
| Seats2: | 8 |
| Seat Change2: | 4 |
| Popular Vote2: | 18,450 |
| Percentage2: | 36.13% |
| Council Control | |
| Before Party: | Labour Party (UK) |
| Posttitle: | Council Control |
| After Party: | Labour Party (UK) |
| Swing1: | 7.4% |
| Swing2: | 14.26% |
Elections to Southwark Council were held in May 1978. The whole council was up for election with a 28.7% turnout. There were 25 wards rather than the previous 23 and 64 councillors rather than 70.
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The by-election was called following the death of Cllr. Siah Cox
The by-election was called following the death of Cllr. Peter Flower
The by-election was called following the death of Cllr. Enid Boxall
The by-election was called following the resignation of Cllr. Frank Brean