AACR may refer to: Across a Crowded Room, an album by Richard Thompson released in 1985 American Association for Cancer Research, an organization based in Philadelphia, Pennsylvania American Cable and Radio Corporation, a former communications holding company in the middle 20th century previously known as All America Cables and Radio Anglo-American Cataloguing Rules, a publication for library professionals Association for the Advancement of Civil Rights, a political party in Gibraltar Autoritatea Aeronautică Civilă Română ("Romanian Civil Aeronautical Authority")