The London Assembly election of 2012 was an election of members to the London Assembly which took place on Thursday, 3 May 2012, the same day as the 2012 London mayoral election, and the 2012 United Kingdom local elections. Although Conservative candidate Boris Johnson won the Mayoral election, the Assembly election produced the Labour Party's best result since the inception of the London Assembly; this was subsequently surpassed by the party's performance in the 2016 election.

Quick Facts 25 London Assembly Seats 13 seats needed for majority, Turnout ...

2012 London Assembly election

← 2008 3 May 2012 2016 →
25 London Assembly Seats 13 seats needed for majority
Turnout	37.4% 6.9%
First party Second party   Leader Len Duvall James Cleverly[1] Party Labour Conservative Leader's seat Greenwich and Lewisham Bexley and Bromley Last election 8 seats 11 seats Seats won 12 9 Seat change 4 2 Constituency Vote 933,438 722,280  % and swing 42.3% 14.3% 32.7% 1.6% Regional Vote 911,204 708,528  % and swing 41.1% 13.5% 32.0% 2.6%   Third party Fourth party   Leader Jenny Jones Caroline Pidgeon Party Green Liberal Democrats Leader's seat Londonwide Londonwide Last election 2 seats 3 seats Seats won 2 2 Seat change 1 Constituency Vote 188,623 193,842  % and swing 8.5% 0.5% 8.8% 4.9% Regional Vote 189,215 150,447  % and swing 8.5% 0.1% 6.8% 4.6%
Vote plurality Margins of victory

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The Assembly is elected by the Additional Member System. There are fourteen directly elected constituencies, all of which have, to date, only ever been won by the Conservative Party or the Labour Party. An additional eleven members are allocated by a London wide top-up vote with the proviso that parties must win at least five percent of the vote to qualify for the list seats.

All registered electors (British, Irish, Commonwealth and European Union citizens) living in London who were aged 18 or over on Thursday 3 May 2012 were entitled to vote in the Assembly election. Those who were temporarily away from London (for example, away working, on holiday, in student accommodation or in hospital) were also entitled to vote in the Assembly election.^[2] The deadline to register to vote in the election was midnight on Wednesday 18 April 2012,^[3] though anyone who qualified as an anonymous elector had until midnight on Thursday 26 April 2012 to register.^[4]

• Greater London Authority
• Mayor of London