A26 or A-26 may refer to:

• List of A26 roads

• Douglas A-26 Invader, a light attack bomber built by Douglas
• Aero A.26, a Czech reconnaissance aircraft of the 1920s
• Focke-Wulf A 26, a German Focke-Wulf aircraft
• A-26 was the civilian name of the Japanese experimental long-range aircraft Tachikawa Ki-77
• Blekinge-class submarine, also known as the A26 submarine, the next generation of Swedish submarines equipped with stirling engines
• The FAA location identifier for Adin Airport

• HLA-A26, an HLA-A serotype
• The English Opening, in the Encyclopaedia of Chess Openings
• The file extension for Starpath Supercharger cassette images