| ABU | Acceptance for Beneficial use 
| Others |
| ABU | Accepted, But Unusable
| Others |
| ABU | Advance Base Unit
| Others |
| ABU | African Boxing Union
| Others |
| ABU | After-Body Unit
| Others |
| ABU | Ahmadu Bello University
| Others |
| ABU | Ahmadu Bello University, Zaria
| Others |
| ABU | AIDS Budget Unit
| Others |
| ABU | Airman Battle Uniform
| Others |
| ABU | Albania Bibliotec University
| Others |
| ABU | Algemene Bond Uitzendondernemingen
| Others |
| ABU | Alisher Burkhanovich Usmanov
| Others |
| ABU | All B*tches Unite
| Others |
| ABU | All Bugged Up
| Others |
| ABU | All Buggered Up
| Others |
| ABU | Alliance Biblique Universelle
| Others |
| ABU | Always Be U
| Others |
| ABU | Always Bloody Useless
| Others |
| ABU | American Board of Urology
| Others |
| ABU | Amphibious Beach Unit
| Others |
| ABU | Analog Back- Up
| Others |
| ABU | Analog Back-Up
| Others |
| ABU | Analog Backup US
| Others |
| ABU | Anyone But United
| Others |
| ABU | Application Business Unit
| Others |
| ABU | Arabian Breeders United
| Others |
| ABU | Arlington Baptist University
| Others |
| ABU | Artificial Breeding Unit
| Others |
| ABU | Asian-Pacific Broadcasting Union
| Others |
| ABU | Association des Bibliophiles Universels
| Others |
| ABU | Association of Banyan Users
| Others |
| ABU | Association of World-Wide Bibliophiles
| Others |
| ABU | Atlantic Baptist University
| Others |
| ABU | Autoblog Uruguay
| Others |
| ABU | Automotive Business Unit
| Others |
| ABU | Auxiliary Back-Up Unit
| Others |