The first elections for members of the London Assembly were held on 4 May 2000, alongside the first mayoral election.
The assembly elections used the additional member system, a form of mixed member proportional representation, with 14 directly elected constituencies and 11 London-wide top-up seats.
|- !rowspan=3 colspan=2 | Parties !colspan=10 | Additional member system !rowspan=2 colspan=5 | Total seats |- !colspan=5 |Constituency !colspan=5 |Region |- ! Votes !! % !! +/â !! Seats !! +/â ! Votes !! % !! +/â !! Seats !! +/â ! Total !! +/â !! % |-
|- | || Total || 1,585,785 || || || 14 || || 1,659,630 || || || 11 || || 25 || ||