A3, A03 or A.III may refer to.
The following roads are numbered 3A.
The Long March 3A, also known as the Chang Zheng 3A, CZ-3A and LM-3A, is a Chinese orbital carrier rocket.
The Northern Nevada 3A Region is a part of the Nevada Interscholastic Activities Association, governing the northern half of Nevada for high school athletics.
Stalag III-A was a German World War II prisoner-of-war camp at Luckenwalde, Brandenburg, south of Berlin.
3A is a German pop band consisting of brothers Aaron, Abel, and Adam Lovac.