William Cooper Gregory (1895 – 23 October 1970) was a New Zealand politician who was the Mayor of Lower Hutt from 1949 to 1950.

[1] He was elected a member of the Lower Hutt Borough Council on a Citizens' Association ticket from 1938 to 1949.

[3] When Hay resigned mid-term in January 1949 Gregory was elected mayor in March 1949 at a by-election.

At the November 1950 election Gregory was defeated for the mayoralty by Labour Party councillor Percy Dowse.

[4] He retained an interest in civic affairs and in 1951 he was one of the objectors to the proposal of the new Labour majority council to relieve High Street congestion by putting a new road through Riddiford Park, linking Barraud Street (then a cul-de-sac) to Kings Crescent.