Glenbrook is a rural and industrial area in the Auckland region of New Zealand.

The industrial area, that of New Zealand's major steel mill, New Zealand Steel, is not located close to any towns - the surrounding countryside is occupied by farms.

[3] Glenbrook was chosen as the site due to the area's proximity to the Waikato North Head ironsand mine and the Huntly Power Station.

[4] Glenbrook statistical area, which includes Glenbrook Beach, covers 53.16 km2 (20.53 sq mi)[1] and had an estimated population of 2,760 as of June 2024,[2] with a population density of 52 people per km2.

The results were 78.6% European (Pākehā); 13.0% Māori; 8.1% Pasifika; 12.4% Asian; 1.7% Middle Eastern, Latin American and African New Zealanders (MELAA); and 2.6% other, which includes people giving their ethnicity as "New Zealander".