Organizations
Ariel Press
Aristotelian Society
Arizona Center for Medieval and Renaissance Studies
Arizona State University
Arlen House
Armada Productions
Armenian Relief Fund
Arminian Church
Armstrong Browning Library at Baylor University
Army and Navy Stores
Army Clothing Establishment
Army Medical Department
Army Nursing Service
Army of Northern Virginia
Army Prayer Union and Scripture Readers Society
Army Sanitary Commission
Arno Press
Arnold House School, Wales
Arrow Books
Arrowsmith
Art Gallery of Ontario
Art Gallery of Victoria
Art Meets Matter
Art Workers' Guild
Artane Industrial School
Arthur Barker Limited
Arthur Conan Doyle Society
Arthur H. Stockwell
Arthur Hall, Virtue and Co.
Arthur King and Company
Arthus Bertrand
Artists and Writers Guild
Artists International Association
Artists' Benevolent Fund
Artists' Suffrage League
Artizans', Labourers' and General Dwellings Company
Arts and Crafts Movement
Arts and Crafts Society
Arts and Humanities Data Service
Arts and Humanities Research Council
Arts at Home
Arts Council and South Bank Centre
Arts Council England
Arts Council England, East Midlands
Arts Council England, North East
Arts Council England, South East
Arts Council of Great Britain
Arts Council of Northern Ireland
Arts Theatre Club
Arts Theatre, Cambridge