The electoral district of Niddrie is a metropolitan electorate approximately 8 kilometres northwest of Melbourne, Australia in Victoria's Legislative Assembly.

The Niddrie District covers an area of 35 square kilometres (14 sq mi), including the suburbs of Aberfeldie, Airport West, Avondale Heights, Essendon West, Keilor, Keilor East, Keilor Park and Niddrie and parts of the suburbs of Essendon and Taylors Lakes.

The district boundaries include Sharps Road for part of the north, Tullamarine Freeway and Roberts Street for parts of the east, Maribyrnong River in the south, and Sunshine Avenue for part of the west.

It is part of the Upper House Western Metropolitan Region.