Arthur Ivan Nellist RIBA (04/10/1926 – 04/03/2018) was an architect and a partner of the practice Nellis Blundell and Flint, the British Medical Association’s architects.

Ivan was the author of Pippit, Dotherel & Others Case Studies in Architectural and Building Management (1978).

He joined Paviors’ Lodge 5646 in 1973, where he served as Secretary from 1993-98. He was also a member of the City Livery Lodge 3752.