A25, A 25 or A-25 may refer to:

• Aero A.25, a Czech military training aircraft of the 1920s
• HLA-A25, an HLA-A serotype
• Junkers A 25, a German two-seater cantilever monoplane
• Article 25, a UK development and disaster relief charity
• A25 accident report form formerly used by the Fleet Air Arm and featured in a World War II song

• English Opening in the Encyclopaedia of Chess Openings
• Curtiss A-25 Shrike, a World War II dive bomber variant of SB2C Helldiver
• List of highways numbered 25

• List of A25 roads

Topics referred to by the same term

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