James Demaine (1842–6 May 1911) was an English architect, mainly active in the Gothic Revival style.
[1] Born at Bolton Abbey to Emma and James Demaine senior, a gardener and farmer, he was an architect's pupil by 1861 and joined the York-based firm led by Peter Atkinson II, J.
B. and W. Atkinson (now known as Brierley Groom) in 1870.
[1] He became a partner in the firm in 1874 after John's death and taking sole control on William's retirement in 1878.
[1][2] Walter Henry Brierley became a partner of the firm in 1885 and he and Demaine frequently collaborated until Demaine's retirement in 1889.