- ALKB
 - 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
 
                                                                                                                Africa                                                    
                                                                                                                China                                                    
                                                                                                                Japan