A11, A 11 or A-11 may refer to:

Military Aero A.11, a Czechoslovak bomber produced before World War II Consolidated A-11, an attack version of the Consolidated P-30 fighter plane of the 1930s HMS A11, an A-class submarine of the Royal Navy Matilda Mk I, a British Army infantry tank Aggregate 11, a proposed military rocket of Nazi Germany A-11 Ghibli, the Italian designation for the AMX International AMX

Other uses A11 road, in several countries Apollo 11 A-11 offense, an American Football shotgun formation involving 2 quarterbacks and 9 other potentially eligible receivers Arrows A11, a 1989 British racing car ATC code A11 Vitamins, a subgroup of the Anatomical Therapeutic Chemical Classification System British NVC community A11 (Potamogeton pectinatus - Myriophyllum spicatum community), a British Isles plant community Chery A11, a 1999 Chinese car HLA-A11, an HLA-A serotype American Airlines Flight 11, a plane that was hijacked and crashed into the World Trade Center in the September 11 attacks English Opening, Encyclopaedia of Chess Openings code Apple A11, an ARM SoC mobile processor designed by Apple Samsung Galaxy A11, an Android device developed by Samsung Electronics "A-11" (song), a 1963 country song written by Hank Cochran

See also 11A (disambiguation)