Leonie Alison Cooper is a British Labour & Co-operative Party politician. Since May 2016 she has represented Merton and Wandsworth on the London Assembly. She has served as a Councillor on the Wandsworth London Borough Council since 2006, representing Latchmere 2006–10 and Furzedown ward from 2010 onwards.

The 2016 London Assembly election was an election held on 5 May 2016 to elect the members of the London Assembly. It took place on the same day as the London mayoral election and the United Kingdom local elections. Four parties had AMs in the previous Assembly: London Labour led by Len Duvall, London Conservatives led by Gareth Bacon, London Greens led by Siân Berry, and the London Liberal Democrats led by Caroline Pidgeon.