4th & 9th June 2015 (3)
11th June 2015 (2)
Tower Hamlets Mayoral election
18th June 2015 (2)
25th June 2015 (2)
30th June 2015 (1)
Information collated below by MiddleEnglander
There were 5 by-elections during June with 3 (60%) chaging hands. The results can be summarised by:
| Party | Candidates | Defended | Retained | Gained | Lost | Won | retention rate |
| Conservative | 5 | 1 | 1 | 1 | 2 | 100% | |
| Labour | 5 | 2 | 2 | ||||
| Liberal Democrat | 5 | 2 | 1 | 1 | 1 | 50% | |
| Plaid Cymru | 1 | ||||||
| UKIP | 4 | 1 | 1 | 0% | |||
| Green | 4 | ||||||
| Independent | 3 | ||||||
| Something New | 1 | ||||||
| Tower Hamlets First | 1 | 1 | 0% | ||||
| Total | 28 | 5 | 2 | 5 | 3 | 5 | 40% |
Tower Hamlets First is no longer a registered party so defended the seat as an Independent
Conservatives retained Cardiff, Pentyrch with a 1.2% majority over Plaid Cymru and
- gained Cambridgeshire, Wisbech South from UKIP with a 45.2% majority
Labour gained Tower Hamlets, Stepney Green from Tower Hamlets First with a 4.4% majority and
- gained Cambridgeshire, Romsey from Liberal Democrats with a 2.1% majority
Liberal Democrats retained Sutton, Wallington South with an 11.1% majority over Conservatives.
There were 5 deferred elections for a total of 13 seats in 2015, all held during June. In summary, 3 of the elections for 8 seats saw no change in representation since 2011 with 1 seeing the seat arising from the annual election being retained by the Liberal Democrats who also won a casual vacancy in the same ward defended by UKIP. The 5th election was in a new larger ward following boundary changes where the previous 3 Labour councillors were contesting the ward but only 1 was elected along with 2 Conservatives. This has been classed as 2 Conservative gains / 2 Labour losses.
| Party | Candidates | Defended | Retained | Gained | Lost | Won | retention rate |
| Conservative | 11 | 5 | 5 | 2 | 7 | 100% | |
| Labour | 8 | 4 | 2 | 2 | 2 | 50% | |
| Liberal Democrats | 3 | 1 | 1 | 1 | 2 | 100% | |
| UKIP | 11 | 1 | 0% | ||||
| Green | 6 | ||||||
| Health Concern | 3 | ||||||
| Independent * | 3 | 2 | 2 | 2 | 100% | ||
| Total | 45 | 13 | 10 | 3 | 3 | 13 | 77% |
* all in the one ward
Conservatives retained 2 seats in Kettering, Rothwell (3 seat ward), 2 seats in Christchurch, North Highcliffe & Walkford (2 seat ward) and 1 seat in South Kesteven, Market & West Deeping (3 seat ward)
- and won 2 seats in Wyre Forest, Areley Kings & Riverside classed as 2 gains
Labour retained 1 seat in Kettering, Rothwell (3 seat ward) and won 1 seat in Areley Kings & Riverside (3 seat ward)
Liberal Democrats retained 1 seat in Mole Valley Holmwoods and gained 1 seat from UKIP in the same ward
Independents retained 2 seats in South Kesteven, Market & West Deeping (3 seat ward)
