AL
- aL – (s) Attolitre
- Al – (s) Aluminium
- AL
- (s) Alabama (postal symbol)
- Albania (FIPS 10-4 country code; ISO 3166 digram)
- (i) Anno Lucis (Latin, "Year of Light", in Masonic tradition, most often seen on plaques bearing the founding dates of buildings, in years AD and years AL)
- ALA – (s) Åland Islands (ISO 3166 trigram)
- ALAP – (a) As Long/Late As Possible
- ALARM – (a) Air-Launched Anti-Radar Missile
- ALB – (s) Albania (ISO 3166 trigram)
- ALCOA or Alcoa - The Aluminum Company of America, NYSE:AA
- ALD – (i) Accounting Line Designator (nuclear weapon targeting)
- ALERT – (a) Advanced Linked Extended Reconnaissance and Targeting – Attack and Launch Early Reporting to Theatre
- ALF
- (a) Africa Leadership Forum
- Alien Life Form (cf. ALF (TV series))
- Animal Liberation Front
- ALG – (s) Algeria (IOC and FIFA trigram, but not ISO 3166)
- ALGOL – (p) ALGOrithmic Language
- ALL – (s) Albanian lek (ISO 4217 currency code)
- ALOA – (i) Associated Locksmiths of America, Inc.
- ALOC
- (a) Air Lines Of Communication
- (a) Average Length of Calls
- ALPA – (a) Air Line Pilots Association
- ALS – (i) Amyotrophic Lateral Sclerosis – Automatic Landing System
- ALSHS – (a) Abraham Low Self-Help Systems
- ALSP – (i) Aggregate Level Simulation Protocol
- ALTE – (a) Association of Language Testers in Europe
- ALTACS – (p) Automated decision Logic Tactical Air Combat Simulation
Read more about this topic: List Of Acronyms And Initialisms: A