- ALS
- ALU
- AM
- AM broadcasting
- AM-LCD
- AMD
- AML
- AMLCD
- AMOC
- AMOLED
- AMP deaminase
- AMP-activated protein kinase
- AMPA
- AMPA receptors
- AMPK
- AMPS
- AMQP
- AMR
- AMS
- AMT
- AMiner
- ANCOVA
- AND gates
- AND-OR-Invert
- AND-inverter graph
- ANF
- ANFIS
- ANFO
- ANP
- ANPR
- ANSYS HFSS
- ANT+
- AOA
- AOD
- AOG
- AOI
- AP site
- AP-1
- AP-1 transcription factor
- AP1000
- AP600
- APAF1
- APC
- APCI
- API
- API gravity
- APL
- APP
- APQP
- APR-1400