Gregory Hills is a suburb of Sydney in the state of New South Wales, Australia in Camden Council. The suburb was assigned on 1 August 2008. The suburb was named from the Marist Brothers St Gregory's Chapel on the land before suburban development. Gregory Hills is a suburb of Sydney in the state of New South Wales, Australia in Camden Council. The suburb was assigned on 1 August 2008. The suburb was named from the Marist Brothers St Gregory's Chapel on the land before suburban development. Gregory Hills is a suburb of Sydney in the state of New South Wales, Australia in Camden Council. The suburb was assigned on 1 August 2008. The suburb was named from the Marist Brothers St Gregory's Chapel on the land before suburban development. Gregory Hills is a suburb of Sydney in the state of New South Wales, Australia in Camden Council. The suburb was assigned on 1 August 2008. The suburb was named from the Marist Brothers St Gregory's Chapel on the land before suburban development.