Londonderry is a suburb of Greater Western Sydney, in the state of New South Wales, Australia.

It is 60 kilometres north-west of the Sydney central business district, in the local government area of the City of Penrith.

Its post office opened on 1 February 1935, run by Robert Ernest Nutt, who also ran the attached store, and later became mayor of Castlereagh.

The Northern Road divides Londonderry from Berkshire Park while Cranebrook and Agnes Banks are its boundaries on its southern and western sides.

Londonderry village in the centre of the suburb is a vital community connection point for local residents in the area.