ANR is a three-letter abbreviation with multiple meanings, as described hereafter:
- Absolute neighborhood retract, a type of topological space (mathematics)
- IATA code for Antwerp International Airport
- Accelerated Neuro-Regulation, a method of dealing with opiate addiction withdrawal
- Active Noise Reduction, more commonly Active noise control
- Affidavit of No Records (if no documents exist responsive to a subpoena for documents, this is an adequate response)
- Agence Nationale de la Recherche, a French funding agency for research
- Adult New Reader, a library literacy program
- Adult Nursing Relationship, a type of sexual fetishism (see Erotic lactation)
- Akkineni Nageswara Rao (b. 1923), Indian actor
- Akkineni Nageswara Rao College, sometimes called ANR College
- Alaska NORAD Region, an alternate phrase for the Eleventh Air Force
- Alleanza Nazzjonali Repubblikana, a Maltese pressure group
- Alliance Nationale Républicaine (National Republican Alliance), an Algerian political party
- Ambiguous name resolution, a search algorithm for LDAP implemented in Microsoft's Active Directory
- Anew Revolution, a heavy metal band from Austin, Texas
- "Application not Responding", a message in Android operating system
- Asociación Nacional Republicana (National Republican Association), a Paraguayan political party
- Atmosphere Normale de Reference, a standard used with air compressors
- Australian National Railways
- Automatic Number-plate Recognition, more commonly ANPR (Automatic Number Plate Recognition)
- Awesome New Republic, a two-piece indie band from Miami, Florida
- Agence Nationale de Renseignements, a government intelligence agency of the Zaire