Penrith is an electoral district of the Legislative Assembly in the Australian state of New South Wales since 1973.

[1] It is represented by Karen McKeown of the Labor Party.

It has been traditionally a safe Labor seat for most of its history but has had times where it has fallen to the Liberal Party.

It is now regarded as a key marginal seat.

On its current boundaries, Penrith takes in the suburbs of Penrith, Emu Heights, Emu Plains, Glenbrook, Jamisontown, Lapstone, Lemongrove, Leonay, South Penrith and parts of Blaxland, Caddens, Cambridge Park, Castlereagh, Cambridge Gardens, Cranebrook, Kingswood and Werrington.