An or AN may stand for:

• An indefinite article - see A, an
• A god in sumerian mythology - see An (mythology)
• An occasionally also serves as a human first name, as with An Wang.
• In Japanese cuisine, a sweet bean paste
• An abbreviation for the Ukrainian Antonov design bureau
• Netherlands Antilles, ISO country code
• Aragonese language (ISO 639 alpha-2)
• Army-Navy Equipment Code Designators
• Apalachicola Northern Railroad (AAR reporting mark AN)