China 
Africa 
- Algebraic geometry
- Algebraic group
- Algebraic logic
- Algebraic modeling language
- Algebraic numbers
- Algebraic operations
- Algebraic semantics
- Algebraic solution
- Algebraic structure
- Algebraic surfaces
- Algebraic theory
- Algebraic topology
- Algebraic variety
- Alginate
- Alginic acid
- Algol 60
- Algoma-type
- Algorithm
- Algorithm selection
- Algorithmic bias
- Algorithmic composition
- Algorithmic efficiency
- Algorithmic game theory
- Algorithmic technique
- Algorithmic trading
- Aliases
- Aliasing
- Alicyclic
- Aligned
- Aligner
- Aliivibrio fischeri
- Aliphatic
- Aliphatic compounds
- Aliquat 336
- Alite
- Alizarin
- Alizarin red S
- Alk
- Alkali basalt
- Alkali feldspar granite
- Alkali halides
- Alkali metals
- Alkali salts
- Alkali soil
- Alkali-aggregate reaction
- Alkali-carbonate reaction
- Alkali-silica reaction
- Alkaline
- Alkaline batteries
- Alkaline battery
- Alkaline earth metals
- Alkaline fuel cells
- Alkaline hydrolysis
- Alkaline lysis
- Alkaline phosphatase
- Alkaline soils
- Alkaline water electrolysis
- Alkalinity
- Alkaliphiles
- Alkaliphilic
- Alkalis
- Alkaloids
- Alkalosis
- Alkane
- Alkenes
- Alkenylsuccinic anhydride
- Alkenylsuccinic anhydrides
- Alkoxides
- Alkoxy
- Alkoxy group
- Alkyd
- Alkyl
- Alkyl groups
- Alkyl halides
- Alkyl ketene dimer
- Alkyl phosphates
- Alkyl sulfonate
- Alkyl sulfonates
- Alkylammonium
- Alkylate
- Alkylating agents
- Alkylation
- Alkylbenzene
- Alkylbenzene sulfonate
- Alkylphenols
- Alkyne metathesis
- Alkynes
- All-electric range
- All-in-one
- All-pass filter
- Allan variance
- Allanite
- Allantoin
- Allee effect
- Allele-specific oligonucleotide
- Alleles
- Allene
- Allergens
- Allergic
- Allergic conjunctivitis
- Allergic contact dermatitis
- Allergic inflammation
- Allergic response
- Allergic rhinitis
- Allergies
- Allergy test
- Alleys
- Allicin
- Alliesthesia
- Alliin
- Allocation concealment
- Allocators
- Allografts
- Allolactose
- Allometry
- Allopatric
- Allopatric speciation
- Allophane
- Allophycocyanin
- Allostasis
- Allostatic load
- Allosteric
- Allosteric regulation
- Allotrope
- Allotropes of boron
- Allotropes of carbon
- Allotropes of oxygen
- Allotropes of phosphorus
- Allotropy
- Allowable stress design
- Alloy 20
- Alloy steel
- Alloy wheels
- Alloys
- Alluvial
- Alluvial fans
- Alluvial plains
- Alluvial rivers
- Alluvium
- Allyl
- Allyl alcohol
- Allyl bromide
- Allyl chloride
- Allyl group
- Allyl isothiocyanate
- Allylamine
- Almost everywhere
- Almost surely
- Alnico
- Aloe