Mifflin Emlen Bell (October 20, 1847 – May 31, 1904), often known as M.E. Bell, was an American architect who served from 1883 to 1886 as Supervising Architect of the US Treasury Department. Bell delegated design responsibilities to staff members, which resulted in a large variety of building styles, including Second Empire, Châteauesque, Queen Anne and Richardsonian Romanesque.