- Source: Southend by-election
- Eleanor Laing
- Southend by-election
- Southend West and Leigh (UK Parliament constituency)
- 2022 Southend West by-election
- Southend-on-Sea
- Southend West by-election
- Southend East and Rochford (UK Parliament constituency)
- 1927 Southend by-election
- Southend United F.C.
- Southend-on-Sea City Council
- 2024 Southend-on-Sea City Council election
Southend by-election may refer to several by-elections in the town of Southend, England:
1927 Southend by-election, after Rupert Guinness was elevated to the Lords (won by Gwendolen Guinness)
1959 Southend West by-election, after the death of Henry Channon (won by Paul Channon)
1980 Southend East by-election, after the death of Stephen McAdden (won by Teddy Taylor)
2019 Milton by-election, in Southend council's Milton ward, after the death of Julian Ware-Lane
2022 Southend West by-election, after the killing of David Amess