A. P. Watt and Son.

• Corporate body
• 1875-

Academy of Medical Sciences, 1998 -

• Corporate body
• 1998 -

Aerofilms and Aero Pictorial Limited.

• Corporate body
• 1934-1960

Alan Ross Ltd.

• Corporate body
• 1965-

Alnwick Union Workhouse

• Corporate body
• 1840-1930

A-N The Artists Information Company

• Corporate body
• 1980-

A-N The Artists Information Company(1980-)

• Corporate body
• 1982 - Present

Andre Deutsch Ltd. Publishers.

• Corporate body
• 1951-

Anvil Press Poetry.

• Corporate body
• 1968-

Appleby Grammar School

• Corporate body
• c.1452-