William Hull (1843–1934) or William Adin Hull, was an English architect who worked in Northampton.

Hull's father, also William Hull, was an architect and Northampton town surveyor.

Hull junior's wife was Kezia Aldam of Crowle in Lincolnshire, who was William Hull's cousin.

They had four children, and their son Charles Cornelius Hull was an architectural draughtsman.

William Hull lived and worked at 14 St Giles Street, Northampton.