| Election Name: | 1980 Southend East by-election |
| Type: | parliamentary |
| Country: | United Kingdom |
| Seats For Election: | Constituency of Southend East |
| Ongoing: | no |
| Previous Election: | 1979 United Kingdom general election |
| Previous Year: | 1979 |
| Next Election: | 1983 United Kingdom general election |
| Next Year: | 1983 |
| Election Date: | 13 March 1980 |
| Candidate1: | Teddy Taylor |
| Party1: | Conservative Party (UK) |
| Popular Vote1: | 13,117 |
| Percentage1: | 36.8% |
| Swing1: | 19.3% |
| Candidate2: | Colin George |
| Party2: | Labour Party (UK) |
| Popular Vote2: | 12,687 |
| Percentage2: | 35.6% |
| Swing2: | 6.5% |
| Candidate3: | David Evans |
| Image3: | Lib |
| Party3: | Liberal Party (UK) |
| Popular Vote3: | 8,939 |
| Percentage3: | 25.1% |
| Swing3: | 12.0% |
| MP | |
| Before Election: | Stephen McAdden |
| Before Party: | Conservative Party (UK) |
| After Election: | Teddy Taylor |
| After Party: | Conservative Party (UK) |
| Turnout: | 62.5% |
The Southend East by-election of 13 March 1980 was held after the death of Conservative Member of Parliament (MP) Stephen McAdden on 26 December 1979. The seat was narrowly held by the Tories in the by-election.[1]