Leppington is an electoral district of the Legislative Assembly in the Australian state of New South Wales in Sydney's south-west. It was contested for the first time at the 2023 New South Wales state election.
On its current boundaries, Leppington takes in the suburbs of Austral, Carnes Hill, Catherine Field, Cecil Hills, Cecil Park, Denham Court, Eagle Vale, Eschol Park, Horningsea Park, Hoxton Park, Kearns, Kemps Creek, Leppington, Middleton Grange, Prestons, Raby, Rossmore, Varroville and West Hoxton.
Leppington was created in 2021 as a result of redistribution by the New South Wales Electoral Commission. It incorporated suburbs from the existing electorates of Camden, Campbelltown, Holsworthy, Liverpool, Macquarie Fields, and Mulgoa.