Codes:

• American Samoa (ISO 3166-1 country code)
• Asmara International Airport (IATA airport code)
• Assamese language (ISO 639 language code)

Computer science:

• ObjectWeb ASM, a Java library for bytecode modification and analysis
• Abstract state machines, based on the concept of an abstract state machine in computer science
• Active shape model, a deformable contour model used in computer vision
• Algorithmic State Machine, a method for designing finite state machines
• Any-source multicast
• Application Switcher Menu, in Mac OS
• Assembly (demo party), a demoscene event in Finland
• Assembly language, a low-level programming language
• Automatic Storage Management, in an Oracle database
• Auto-sequencing memory

Organisations:

• ASMclothing, or Altered State of Mind, an apparel company based in Cleveland, Ohio, USA
• ASM Formule 3, a French motorsport team in the Formula Three Euroseries
• ASM International (society), formerly the American Society for Metals, a professional organization for materials scientists and engineers working with metals
• ASM International (company), a Dutch semiconductor company
• ASM Team, a Portuguese motorsport team in the Le Mans Series
• Abnormal Situation Management, a research and development consortium of companies and universities that are concerned about the negative effects of industrial plant incidents
• Academy of Sciences of Moldova
• Actuarial Society of Malaysia
• Agency Sector Management (UK) Limited
• American School of Milan
• American Society of Mammalogists
• American Society for Microbiology
• Associated Students of Madison, the student government at the University of Wisconsin-Madison
• Association for Systems Management
• Assotsiatsia Sovremennoi Muzyki (Association for Contemporary Music), a Russian organization for contemporary composers
• Australian Society for Microbiology

Military:

• Academy Sergeant Major, the senior warrant officer at the Australian Defence Force Academy
• Air-to-surface missile
• Anti-ship missile
• Artificer Sergeant Major, a warrant officer appointment in the British Army's Corps of Royal Electrical and Mechanical Engineers

Other:

• Acceleration Simulation Mode, a test used in automobile emissions control
• Activated sludge model, in sewage treatment
• Airspace management
• The Amazing Spider-Man, a comic book published by Marvel Comics
• Ants Sleeping Model
• Assistant stage manager, a back-stage post in theater
• Auto Shift Manual, a car transmission system, using a combination of auto-clutch and shift-by-wire technology
• Available seat miles, a financial term used in air travel circles
• Antisocialmedia, a criticism website run by Judd Bagley
• Assistant manager
• Alternating sign matrix