A400 may refer to:

• A400 road (London)
• Airbus A400M Atlas, a military aircraft
• Canon Powershot A400, a Canon PowerShot A camera model

• Luque (disambiguation)
• Luquillo
• Luquillo Forest Lidflower
• Luquillo, PR
• Luquin
• Lura
• Lurago d'Erba
• Lurago Marinone
• Lurah Bilut
• Luraine Tansey
• Lura Lake
• Lurano
• Luras
• Lura (singer)
• Lura S. Tally
• Lurate Caccivio
• Lura, Tibet
• Luray Cave
• Luray Caverns Blind Cave Millipede
• Luray High School
• Luray (VA)
• Lurch Duck
• Lurch McDuck
• Lurcio
• Lurcy