William Killigrew Wait (21 December 1826 - 13 December 1902) was a Bristol merchant and the Conservative Party member of Parliament for Gloucester elected in the 1873 Gloucester by-election.
His opponent was Thomas Robinson of the Liberal Party who was subsequently elected in 1880.
The 1873 by-election was bedeviled by accusations of corruption but an enquiry by the Electoral Commission upheld Wait's victory.His daughter Frances Katharine Wait married Charles Chadwyck-Healey on 17 May 1884.
He was converted to the cause of women's suffrage by the forced resignation of Eliza Walker Dunbar from the Bristol Royal Hospital for Children.