Grey is a former parliamentary electorate in the West Coast region of New Zealand.
The electorate of Grey Valley, created for the 1871 general election, was succeeded by the electorate of Greymouth in the 1881 general election, and lasted until 1890. In 1890 the Grey electorate was created, and was abolished in 1919.
The 1870 electoral redistribution was undertaken by a parliamentary select committee based on population data from the 1867 census. Eight sub-committees were formed, with two members each making decisions for their own province; thus members set their own electorate boundaries. The number of electorates was increased from 61 to 72, and Grey Valley was one of the new electorates.
Throughout the electorate's history, the town of Greymouth was always included in its area. The town of Brunner belonged to the electorate during most periods.
Grey Valley existed from 1871 to 1881. William Henry Harrison was the first representative from 1871 to 1875 when he retired. Harrison had previously represented Westland Boroughs from 1868 to 1870.
The electorate was represented by two members from the 1876 election onwards. Martin Kennedy and Charles Woolcock were elected in 1876; Kennedy resigned in 1878 and Woolcock retired at the 1879 election. Kennedy was succeeded by Richard Reeves in an 1878 by-election. He was defeated in 1881 when he stood for Inangahua. Edward Masters succeeded Woolcock in the 1879 election. Masters resigned in 1881 and was succeeded by Thomas S. Weston in an 1881 by-election. Weston stood in Inangahua in the 1881 general election and was successful.