Cook and Westmoreland was an electoral district of the Legislative Assembly in the Australian state of New South Wales in the first and second Parliaments (1856–1859), named after Cook and Westmoreland counties in the Blue Mountains, Lithgow and Oberon areas. It elected two members simultaneously, with voters casting two votes and the first two candidates being elected. It was largely replaced by Hartley, however both members moved to other electorates, James Martin became the member for East Sydney, while Robert Jamison became the member for Nepean.
